If you like platformers, try the Megaman Zero series(GBA/DS), any Mario game ever, any Sonic game ever, and I guess Uncharted counts as platforming. For RPGs, try Final Fantasy(I personally recommend numbers IV-VII and the original Tactics if you like strategy), Fire Emblem(Most Nintendo systems, although if you're buying them in English or don't want to download and patch JP only games, GBA/Wii only), Yggdra Union(GBA/PSP, it's strategy. And hard.), Megaman Battle Network series(GBA), or Pokemon(GBA/DS/Wii). This would be easier if you specified exactly which type of game is your favorite and if you're going to download ROMs to play on an emulator.