So, Im going to get a couple STEAM Games for Christmas (Thats not all of it through :P), but I cant decide what games I should get.

I currently have these games:

Audiosurf
CounterStrike-Source
Garrys Mod (ZS was awesome )
Half Life 2
Half Life 2 Episode 1
Half Life 2 Episode 2
Left 4 Dead (The best game I avar played :awesome
Portal (Companion Cubes ftw )
Team Fortress 2 (Fun game)
Universe At War (Horrible buy, I thought it would be fun. No one on Live, and I do mean NO ONE. High graphics game too )

Those are it. Any moar suggestions?

Personally I am thinking of getting GTA4, Unreal Tournament, Farcry 2, or Fallout 3.