What are you playing right now?

[Crop]

Anyone got any recommendations of a decent PC game I can download from Steam? I have another month to kill and I'm open to suggestions.

Any particular genre? I have like 350 games on Steam so I'll have to narrow it down.

If you liked the original Deus Ex then Human Revolution is very good.

I thoroughly enjoyed HR, I had it for the PS3.

I'd say turn based, strategy games are what I'm looking for at the moment. Normally I wouldn't have a problem helping myself to games, but PC gaming is something I haven't followed...ever, I only just got myself a Steam account! So I'd appreciate any suggestions you could give.