Wish you had a PS3 or PS2 so you could play Ico, and Shadow of the Colossus. I bet you would love those games.
So I had to choose between Mass Effect and Bioshock. I guess I pick Bioshock.
I never played 4 of the series in this category. I've only played 1 Halo game (Reach) and it's ok. I'm not a hardcore shooter fan; I'm more into platforming and action/adventure games. And I also only have 360 and Wii.