What are the best games for sega Dreamcast?

Sonic Adventure 1 and 2, Marvel vs Capcom, Soul Calibur, Jet Set (Grind) Radio, Virtua Tennis 1 and 2, Shenmue 1 and 2, Crazy Taxi 1 and 2, Power Stone 1 and 2, Dead or Alive 2, Skies of Arcadia, Phantasy Star Online, Tony Hawk's Pro Skater 2, NFL 2K series (if you're American), NBA 2K series, Sega Rally 2, Chu Chu Rocket (good multiplayer, not so fun if you're alone), House of the Dead 2, Ecco The Dolphin: Defender of the future, Resident Evil: Code Veronica, Fur Fighters, Samba De Amigo and Seaman.

Now the Dreamcast has been discontinued, you can get most of them games cheap and they're good value. However, some are rare games and can go for a lot of money on sites like eBay despite the Dreamcast being dead 8 years now.