Best FPS or Similar xbox 360 online mutiplayer game?

Buying a new 360 game today but dont know which to get.
I have Battlefield Bad Company
Frontliners and GTA IV
so I’m into these types of games, was thinking maybe Halo or COD 4?
Anyone have any recommendations?
Thanks
Answer #1
Buy COD 4.
Answer #2
GTA IV isn’t an FPS, it’s third person.
Halo 3 is stellar.
Answer #3
COD 4, definitely give it a try. Halo is also fun.
Answer #4
thanks for your feedback, COD 4 or Halo 3 it is!?
Answer #5
You want to play it for achievements? For multiplayer? For Singleplayer? To play it with friends?
Be more specific.
Answer #6
cod 4 AND Halo 3
Answer #7
Yeh get both, but if you have to choose, cod4 by far.
Answer #8
Cod4,5 other fun games…Left4dead,Gearsofwar2 If you are scarce on money..just wait for COD4two
Answer #9
Yer can’t wait for the new COD! Iv never played Halo online only Single player so that could be fun!
Thanks for the comments ppl