Tele boot suggestions

Finally wore out the T2 boots and looking for something versatile for backcountry in the Cascades, some lift skiing, and a Sierra Traverse in the spring. Tried on the T2 Ecos (didn't like), Black Diamond Push (comfy but 4 buckle and beefy), and also looked at the Black Diamond Seeker as a possibility.

Ski a mid fat - crossbows, but likely picking up a powder ski this year as well. Help! Suggestions and experience? You know the drill, also need to hike a bit in summer. Thanks.

My inspector Clouseau instinct tells me that I'm picking up from the clues you provided is that you want a boot that has a little better tour ability than lift use, but needs to be beefy enough to handle driving a bigger ski in the future, or getting your dollars worth out of lift skiing.
It looks like you are on the right track, but maybe are taken back by the weight/bulk issue of the BD Push. The Seeker looks like what you would pick, but it may lack the power you may want for the lift and may not drive a fatter board that you covet.
Like choosing health care plans there seems to be no perfect marriage where it benefits all applications.
I like my possible error in judgment to be on the side of more, but certainly not go overboard on the more thought, like Scotsman and his wide ass...boards. So I would get the slightly beefier addition like say the Push. Because although it weighs a little more it will do all the things you need on the lift and BC. So when things get rough you'll be glad you have the extra Push. Yes, I'll be here all week and tip your waitress well. And it will drive a wider board (like up to 105 waist) when you step up from the Crossbow, get crazy and go into the upper 80's midwaist for a powder board. 
Maybe set your sights on the skis that works for your terrain preference, then go from there.
But based on what I'm reading into this with my own desires, I would push for the Push.
I do not have any experience with the Garmont line since they make a narrow AT boot that fits me, but make a wide tele boot that I swim in. But other tele brethren like the Garmont  boots, but tend to tour on the beefier version to drive their Verdicts. 
FWIW=I have been looking at the binding systems a little more closely since I am convinced that the BDo1-midstiff has too much tip drive to be consistent in BC powder, but kicks ass on liftpack (that's my new word and I'm trademarking it).
Good luck, keep asking questions, even if you don't you'll get cargo ship of direction here.

If the BD shape fits your foot (BD box fit is quite good for most), I think the Seeker or Push would be great for your purposes.
My two cents having skied both (and a BD foot):

Push and Seeker have same bellows stiffness.  The upper boot is a little stiffer on the Push, although I'm not sure you'd notice a slightly stiffer cuff w/tele's.
What you will notice is that the Push is a little taller w/4 buckles, and beefier power strap, so a better "clamp" on the lower leg/more lateral leverage, and better suited to put a fatter ski on edge.
FWIW, my Seeker's were taller, w/a stiffer bellows than my black and grey T1's, which seem to be accepted as "fat" worthy.  Generally, I think the Seeker is pushing its limits at around a 100mm waist, and this guestimation increases in line with the skier's skill level.
Here's the kicker:
Although slightly heavier, I found the Push to tour/hike better.  Why?...  Look at the buckle placement.  The Seeker's middle buckle crosses over the ankle hinge point, so the buckle effectively interferes/stiffens the ankle pivot while in "walk" mode. This is amplified if you are a person who climbs/walks with your buckles tight.  The Push's middle buckles divide the buckle/boot mechanism into separate lower/upper sections, so the boot hinges more freely wether your buckles are tight or not.
  The Seeker is more than enough boot for your current setup, and I think you'll find it much more stiff than your older T2's (I think a good thing) but if the weight/height/cost of the Push doesn't matter, it may be your boot.
Just remember, it's true what people say: "BD liners pack out", so I recommend fitting with your toes a little more cramped than "touching" the fronts.  From experience, I'd rather blow out the fronts of the shells than shim the hell out of a sloppy fit.
"What do I use?":
Customs, of course!  But I'm a member of the "Fat Rockers" club

BTW, according to Scotsman, your skis fall into the "skinny assed retro sticks" category.  :-[, but what does he know?  He's an over the hill jibber

  He's an over the hill jibber

We'll see who's over the hill you callow youth!
When you start whining about how hard teleing is in deep, deep snow this season I'm not going to wait for you anymore!

Thanks for your take on that Kneel.
We skied that foggy day at Crystal when you got those Customs. I think that they still had the tags on them. Are they a stiffer driver than the T-1's? My T-1's are only a couple years old and I think that they really put down the business, but I fit them way to tight to tour on them.

I use a T3 to power my Karhu Guides. I have tried them with my Kailas skis, and they can handle them because of the power of the BD o1 binding.
I think the Seeker would be a good candidate to replace the T3. But that middle buckle is a deal buster-thanks for the insight.
I really noticed that the Switchback binding has a lot more freedom of movement and a better ride in the Powder than the driving force of the o1. The trade off is that the Switchback gives me less confidence and less stability on the liftpack snow. More like the old school days.
As I get older more equipment stability makes up for my lack of power, balance and flexibility like I had in my 20's and 30's.

The two lower buckles on the Push seem so redundant, that it seems like one buckle would have been suffice. Must be a reason for that?
I rarely even buckle the top buckle on my T1's when skiing , even the strap is loose, I like more forward flex and I ski them in walk mode too. So I think the buckle that could be eliminated is the top buckle on a stiff boot.

Thanks. As usual I appear to be slightly (or more) behind the gear advancement curve. But I guess you just get used to what you're skiing in and I found the T2 just fine for lift, Nisqually chute, and things like Vesper.

But true - crossbows are a bit narrow for the steeper and deeper, which I found out while a week in the Wallowas - got taken to serious powder school. So a bit wider ski is also in the works. Like the new touring mode of bindings such as the hammerhead, which I guess helps with a beefer ski.