I want a new FPS and i dont know what to get so im hear for opinions on which one i should get out of these 3:
Battlefiled Bad Company 2.
Crysis 2
Homefront

I would be getting them for PC

Not Homefront.
Battlefield is focused around teamwork, it has very large and open maps, vehicles are fully supported. Crysis is more individually skilled, it's also different from your typical generic FPS due to the Nanosuit. And, of course, Crysis has amazing graphics. Depends on which aspect you prefer in your FPS games.

Red Orchestra: Ostfront 41-45 is another great fps but you can use Tanks and it has DS, free mods
And you can pick it up ￡6.99 on steam its only mp but they will be releasing the new one some time this year
Red Orchestra 2: Heroes of Stalingrad look great PC only game

Don't buy Crysis 2 way too many issue especially the multiplayer options there is alot of people that cant even play