I am planning on getting Left 4 Dead 1 & 2, Resident Evil 5, The Sims 3, Star Wars: The Force Unleashed, Halo 2 (since there is no Halo 3 for PC), a Logitech headset for online game play, and two Logitech controllers. But before I spend all this money, I just wanted to know how PC games and 360 games are similar/different. For Example: Are there achievements? Can you use your xbox gamertag? Can you have friends/talk to others who are on LIVE? Please help, thanks. 