This is always what I imagined Thanos' voice as.
[YT]shKS8bYeFmg[/YT]
The voice of 'The House' is Michael Sheen, a relatively popular British stage and film actor. He's been in stuff like Kingdom of Heaven, Tron: Legacy, some of the Twilight films and Alice in Wonderland.
Are you kidding me?! Michael Sheen? Why the hell didn't I think of him as an option! I love this guy & he's a phenomenal actor...everything he does (imo) is gold.
Him doing Thanos' voice/motion capture would be awesome. He's no stranger to highly physical films either seeing as he's starred in two
Underworld films. Needless to say his character is my favorite along with Beckinsale's.
So yeah, f'n A on calling this one dude.

t:
Okay, so out of all the potential choices out there, all of the ones I like would be:
Kevin Grevioux
Bryan Cranston
Michael Sheen
As it stands, Sheen is my favorite choice thrown out into the universe as of yet. He has just the right swagger to pull it off. And considering I've always believed him to be far too underrated, I'd geek all the way out if he did get cast.
Btw, a character can be done via motion capture with the actor being on set. Bill Nighy, who portrayed Davey Jones in the Pirates of the Caribbean sequel, did motion capture but it was accomplished while he was on set. Kinda like what they did with Ruffalo in TA too.
It'll be much more effective to have the actor there...it makes the reactions as genuine and believable as possible. Plus, I'd like to think it would give the artists who do the rendering a better frame of reference.