I personally wouldn't get MW2 at all and would instead get Battlefield Bad Company 2 since the PC beta is coming out in 2 weeks.
I have been playing the PS3 beta and must admit that this is FINALLY a real battlefield game. I'll be getting the PC version because of the enhancements and controls but would highly urge any old school battlefield fan to keep an eye on that game regardless of the platform. DICE is finally returning to form and is actually developing the game to use the strengths of each platform.
40 players online for PC
DX11 support for PC
MOD SUPPORT!!
Squad play expanded (PC version will get commanders like BF2)
This game completely kicks any COD game right out the window.
It really reminds me of BF2 but updated.
Current Favorites:
Wii - Muramasa, MH3, Metroid Trilogy, RS2, Okami, RE4, COD, Dead Space, Scarface
PC - L4D, TF2, BFBC2, Killing Floor, Aquaria, Warsow, many UDK indie games
Mods - MechWarrior:Living Legends, Star Wars: Galatic Warfare, PVKII, Goldeneye Source, L4D mods
PS3 - Demon Souls, Way of the Samurai 3
Social Modding Club: ModDb | Steam