The ML Sentinel looks really cool along side a bunch of X-men Mates
But another choice is the Heroclix Sentinel.
Check it out in my Yard Sale thread, I have a pic there. It's not close to the size as the ML one, but it is quite nice looking.....but, sadly it has no articulation at all.
Just a thought for ya!
Honestly, I chose the Marvel Legends version for my mates.