What to buy for a girl who plays DotA 2, Portal 2... and has HL2 on wishlist.

I need your help, people.

It's summer sale right now and I want to buy for my friend (girl) something, but she seems to be on vacation since 10 days ago.

If there's nothing good I will buy her the HL C.Pack at the end of sale.

But I want recommendations from you guys/girls so I can keep my eyes on and buy it when it is on sale.

Thanks,
.

List of games:

001: Dota 2 8.0 hours 52.0 hours

002: Portal 2 Stats 1.4 hours 116.7 hours

003: A.R.E.S. Stats 0 4.6 hours

004: Alien Swarm Stats 0 3.2 hours

005: Amnesia: The Dark Descent 0 0

006: Bastion Stats 0 44.4 hours

007: BIT.TRIP RUNNER Stats 0 0

008: Blocks That Matter Stats 0 0

009: Braid Stats 0 0.9 hours

010: Chaser 0 25.0 hours

011: Choplifter HD Stats 0 8.9 hours

012: Critical Mass Stats 0 1.6 hours

013: Cubemen Stats 0 8.8 hours

014: EDGE Stats 0 7.0 hours

015: Fractal: Make Blooms Not War 0 1.4 hours

016: Future Wars 0 4.4 hours

017: Half-Life 2: Deathmatch 0 0

018: Half-Life 2: Lost Coast 0 0

019: Jamestown Stats 0 12.6 hours

020: LIMBO Stats 0 0

021: Lone Survivor 0 0

022: Metro 2033 Stats 0 0

023: Portal Stats 0 0

024: PoxNora Stats 0 1.8 hours

025: Psychonauts Stats 0 0

026: Puzzler World 2 Stats 0 5.4 hours

027: Q.U.B.E. Stats 0 0

028: RUSH Stats 0 0

029: Spiral Knights Stats 0 0.4 hours

030: Superbrothers: Sword & Sworcery EP Stats 0 0

031: Super Meat Boy Stats 0 0

032: Trapped Dead 0 1.7 hours

And Wishlist:

CS GO, HL EP1, HL EP2, Transformer: War for Cybertron, Alien Breed Series.