[Sephor]

Hmmm, depends on what type of games you like really id suggest-
Gears of war
Lost odyssey(maybe blue dragon also, i dident enjoy it as much of lost odyssey tho made by same studio)
The elder scrolls IV: Oblivion
Forza motorsports 2
PGR4
Ghost recon advanced war fighter 2
Halo 3 maybe if you played the other halo's not as good as first halo but still good for story and online co-op.
Those are only games that come to mind that i enjoyed most, probably more tho cant think of any atm.

Also if you have Xbox live you can DL a bunch of demos for alot of games to see what you like. (dunno if you can DL the demos with silver, either way you get a free month or 2 after you make a Xbox live account and most games come with a card in them for a free month of xbox live)