Hey, my friends and I are bringing back out the Dreamcast and I wanted to get your opinions on the must games to have for the Dreamcast! We are casual gamers, not really into RPGs but we are opened to anything. Below will be the games I own with the ratings I give them (you can understand the kind of gamer I am) and the games I am interested in getting.

My collection
WWF Royal Rumble (9.8 BEST WWF GAME PLAY EVER)
World Series Baseball 2K1 (7)
Unreal Tournament (8)
Tennis 2K2 (5)
Soul Caliber (9)
Sonic Adventure 1 (9)
Silent Scope (8)
Sega Bass Fishing (4)
NFL 2k1 (9)
NBA 2K1 (9)
Daytona USA (8.5)
Airforce Delta (6)

Interested Games
Sponic Adventure 2
NFL Blitz 2000/1 (4 Player)
Sega Rally 2
Sonic Shuffle
Sydney 2000
Star Wars Demolition - ? split? gameplay no aim?
Mobile Suit Gundam E.F.F VS Zeon & DX

What are you feelings about the games I am interested in? Good/Bad?

Not Interested
Phantasy Star Online
Power Stone 1/2
Crazy Taxi
Jet Grind Radio
Marvel Vs. Capcom 1/2
Ready 2 Rumble Boxing
Tony Hawk Pro Skater

I have already played all the games above on other systems, except Power Stone... which just isnt my style of game.

Conclusion
So I am looking to find out if there are any of games I am missing that are a must have. Im mainly looking for fun 4 player games (with 4 controllers). Also looking for any more wrestling games and I am even willing to get an import for the Gundam game or any game if you feel it is good enough.

Thanks!