Great list bro! Winter Soldier, Captain America, Wolverine, Silver Samurai, Cable, Warpath, Sabretooth, and Thanos are my most favorite.
@irishx: I liked his solo series from about 8 or nine years ago, it was good, but my favorite Thing stories were from "Marvel-Two-in-One" back in the 70's.
It's always good to see the Thing on a list of favorites!
I love the Thing but since I don't read FF I only see him during Marvel events or when he guest appears in another comic I'm reading. I've always meant to pick up that solo series he had though.