Resident Evil 5 is on sale for $10 on both gamersgate and greenmangaming

You can also pick up both Saints Row 2 & 3 on sale for like $11 or $12 total on gamersgate

Any game by Valve

Save it for retirement!

Awesomenauts definitely

killing floor. endless entertainment

buy bacon.

Magicka!

food.

Omerta on Nuuvem >http://www.nuuvem.com.br/produto/1064-omerta-city-of-gangsters

Fallout 3

System Shock 2 from GOG or a Bastion steam key from the Humble Store. If it's steam wallet or you only want something to buy from steam, Hitman Blood Money.

food

mirrors edge kept me entertained for HOURS! First and last good game from EA. :)

If you can manage to buy Sleeping dogs for 10$... do it.
I liked it very much

Bastion. Best game ever.

FTL

I just got Orcs Must Die!, you could get that :D
Or FTL: Faster Than Light looks amazing too :D

dlc quest , cart life and bastion

Gmod, HL2, HL...

a pack of cigarettes.

gamefly $6.49 for Torchlight 2

Jagged Alliance 2 Gold. On a 75% off sale right now.

The Binding of Isaac

Edit: You already have it so I'll change it to Braid. (:

Dont STarve....you get it twice and you cant trade one (as i did today for Just Cause 2)

Isn't Fallout 3 $10 on Steam? If your rig can handle it, you could always try that... if you can optimize it for Windows 7, that is.