So I just acquired an Xbox 360. What do you guys recommend?

I got it off of a friend who was just looking to get rid of it, since it is rarely used. I already own a PS3 and a Wii, as well as a decent gaming PC. Obviously what I'm looking for is 360 exclusives, or games that can just be found for dirt cheap on the console in comparison to others. I'm a fan of Japanese titles in specific, and I've already grabbed Deathsmiles and Lost Odyssey. I've also got Gears of War 2 in my possession. I plan on getting Tales of Vesperia and Blue Dragon for sure. I'm open to anything, though. So just throw it out there and why. Thanks in advance!