Just need some suggestions for Xbox

If your into zombies than I would suggest Left 4 Dead 1 & 2. You can get both for cheap now and they're great fun (Xbox exclusives). The Dead Space series is a nice grab as well. Shooter wise, Rage is a solid FPS and really pushes the Xbox to its limits
visually. I'm sure it's one of the top 3 best looking games on the Xbox. As someone already mentioned Borderlands 2 is awesome, can't go wrong with that (you can pick that up on sale Black Friday). Mass Effect 3 has a nice co-op and Black Ops 2 comes out in
a few days. There's tons of games to choose from but I'm half sleep so this is all I can come up with right now lol.

Forgot to mention Fallout 3, Battlefield 3, and GTA4 DLC The Lost and the Damned & The Balled of g a y Tony are Xbox exclusive titles, or at least they were when they came out not sure if they have moved over to Playstation now.

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I've not got it, but heard alot of great things about Portal 2, and also The Orange Box, that also has Portal 1

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It would be just easy to go and buy Call of Duty, but bellieve it or not there is more to gaming than Call of Duty, because you have an Xbox you might as well get into the exclusives, good choice on Halo 4, but there is also Gears of War 3, Gears of War:
Judgement (coming out in March 2013) Minecraft, Forza Horizon (not got it but played for a good 30 minutes in my game shop in town), other than that, you may want to buy the Mass Effect trilogy, if you like Halo you will like Mass Effect too.

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Also there is Red Dead Redemption, it's GTA but in the wild west with cowboys (from the same makers as GTA too) Borderlands 2 is a fantastic game, it's my game of the year so far. Also Skyrim, you will get a good week of gameplay out of that (not real time)

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and yeah get Assasins Creed III

1. Mass Effect 3*
2. Battlefield 3*
3. Assasins Creed II
4. Halo Reach*
5. Spec Op's: The Line
6. Red Dead Redemption*
7. Skyrim
8. Fallout 3
9. Gears of War*
10. Gears of War 2*

Those are the games that I think you will enjoy if you enjoy Gears of War 3

* Has online co-op or multiplayer

nah, some times friends like different games, all games should have a server browser though like vegas.. who needs match making when you can see every game world wide that is going on then pick the one you want.