Best steam game for under $20?

[JoeKnowMo]

I have Steam games that I'd give you a great deal on. I've got Fallout NV: UE, Civ V GOTY, Skyrim, and a bunch more. I have the same username on Steam if you're interested in perusing my inventory.

[Zalis]

Magicka's on sale today for $2.50. It's a great deal on a tremendously fun indie game.

[Смерть]

Dead Space and Dead Space 2 are currently 4.99 ea on Steam.

[Zalis]

If no one's mentioned it, TF2 costs zero dollars and zero cents. (and still gets substantial updates!)