[H] The Cave Preorder [W] 10 keys TF 2

how about L4D GOTY or Don't Starve?

thats a little bit too much. Anyone can easily sell those 10 keys on the steam market, buy the game, and still have some change.

I can offer The Cave for 6 keys.

Sleeping Dog for you The Cave.

Ill offer 6 keys for your pre-order of The Cave, honestly dont think u will get a better offer, but if ur not interested, consider this a free bump :)
I could also offer Miner wars -or- Dead Island GOTY -or- CS Complete.
I also have a Need for speed:The Run Origin key. Some more options to consider.