Looking for Must Buy Games Lists

I'm looking for a small list of must-buy games for PS2, Gamecube, and/or GBA.

I've got some money to spend now due to certain changes in my paycheck distribution, and I'm looking to spend some of it on games each month. I haven't bought all that many (very few actually) in the past couple of years, so great games of the past are very welcome on these lists as well as current games and new releases.

All I have on the slate to buy right now is GT4, so... Help me out here.