As long as the system is stil in excellent shape, I'd buy it (especially if it's the black version). If the games aren't the games you want, I would probably just go with a brand new one for $250 or I would just wait. I've logged in a dozen hours of Super Street Fighter already despite owning it for the 360 and playing it almost daily. You'll fall in love with the portable version and the simplified control options if you're into the series at all.
In fact: http://gamrconnect.vgchartz.com/thread.php?id=131383&page=4#22








