This is going to sound snarky, but with some honesty, you're better off sticking with your Wii, since most of the Dreamcast's best games are getting remakes on it.
Removing the tongue from the cheek, the first Sonic Adventure is alright for its current price. Shenmue is different and new, if clunky. Soul Calibur isn't as good as Soul Calibur 2, but it's dirt cheap now. Skies of Arcadia's alright, although I think it's overrated. Jet Grind Radio is fun and fairly unique, and that goes for Space Channel 5. I'll add any other games I can think of as they come to me.







