Is that the Capullo Batgirl figure in the background? One of the few DC Designer series that I got (along with the Jae Lee WW) just based on the sculpt alone (articulation is kind of crappy with those).
Can't go wrong with the Figuarts Infinity War Hulkbuster. It's not 1/12 scale but is still pretty large and has good reviews. Costs $400 on Amazon.
I also found another figure based on the Age of Ultron version by a company called Comicave that while isn't as good as a toy as the figuarts it's bigger and more detailed. Costs $520 on BBTS.
Figuarts is way undersized, though, or at least the AoU one was.
Also, D-Amazing did a pretty bad job of reviewing the articulation. He doesn't seem to know that there's a piece of armor on the back of the ankle that lifts out of the way to help the foot articulation (like the one in front) He also completely missed that there's a ball joint on a peg at the shoulder that lets you pivot the arms forward and back like a butterfly joint without using that weird pop-out joint.
Run hot water over it, bend it into the right shape and then run cold water over it while holding it in place. Repeat if necessary.
This process is not perfect.
An extreme solution would be to replace the barrels with brass tubing.