Yup Thief looks good, I am going to get it on the Xbox.
I like some stealth games, The Saboteur was great on the 360 and all of the AC games of course. Metal Gear Solid although I only played that on the PS1. Splinter Cell is one that has never interested me!
I agree with ASOT, I like the game to give me the choice of how I want to approach it. That's what I really love about AC, sometimes I hide in the bushes picking off one guard at a time and other times I just jump straight in there, smash a smoke bomb on the floor and cut some throats