Robotech: Battlecry is a lot of quick fun. You know about Buffy. I plan on getting Indy sometime soon, but haven't done so.
Genma Onimusha is fun, if you like a Resident-Evilesque game set in medieval Japan. You fight, instead of run, but the feel and interface is quite similar.
Dark Summit is more fun that it has a right to be, considering how dumb it is. You can get it used for $12. It's snowboarding to stop The MAN. Really.
Splinter Cell ranks as one of the best games I've ever played. It can be frustrating at marks, but it rocks so hard that it's scary.
Soul Calibur 2. August is too far. The Soul Still Burns. Initial reports from importers indicate that it is everything that was hoped for. They even say Spawn isn't that bad....though I still toy with getting the 'cube version, so that I can get Link. Decisions, decisions.
And while we're done discussing the 'cube, Wind Waker is one of the greatest games ever made, IMHO, Period. Metroid is on the list.
And Mario Party and Bomberman are lots of good party fun! Huzzah!