Darksiders on Steam, which is on sale for the aforementioned 10 bucks until 10am PT on Monday, March 21. Seriously, think about it. Is there anything else that will give you so much bang for little?
Yeah, thought so -- though if you know how good a time Darksiders is, you may have already played it (or read this site, we guess), in which case we'd suggest you tell a friend. What kind of monster would keep that kind of knowledge to themself?