What kind of games are you into?
Fable is such a wonderful series! Fable 2 is exclusive to Xbox 360 as far as I am concerned but Fable 3 is available on PC too.
The Rare games Banjo and Kazooie Nuts and Bolts and Viva Pinata are criminally underrated. They're different, but I'd say that they have the same quality as the Rare games back in their golden days!
Blue Dragon is really good too. I picked it up for really cheap a few months ago and I loved it.
Alan Wake is great, but like Uncharted it gets a little tedious in some areas.
Their grittier titles are really good too, but I am not too sure if you would enjoy those. Gears of War is amazing and is definitely one of the highlights of the 7th gen games. Left 4 Dead 1 and 2 are just

But if your PC can handle it, I'd get it for that because of all the mods you can get on them. Otherwise, it feels a lot better playing it on the Xbox.
I think you'd enjoy those tbh.