Well, I voted for TS2, since not only was it the best FPS this year in my opinion, but it was easily in my top 5 overall. That being said, with your self-professed love of RPGs, I think you might find Deus Ex really facinating too. I personally didn't enjoy it, but not because of its quality, it's just that it never really "meshed" with me.
I think for you, either would be fine choices though
