Gears of War 2, Halo 3, or Resident Evil 5?

[Purplekush]

All of these amazing games are only $19.99, and was wondering which one to buy. I am more interested in the single player campaign, and will play a bit of co-op with my friend offline. If you could you tell me which one and why, that would be great.

 

[Rob590]

Get gears or RES5 but what ever you do dont get Halo - the most over rated game in history