I've got all of those DC titles on my XBox...well, I have some Guilty Gear on my Xbox (not Overture). Not a Twisted Metal fan. And I believe someone else mentioned Fear Effect and agreed to look into it.
Oh, and I don't know if this would interest you, but there's a thing called NesterDC which is basically an NES emulator with nearly every NES game out there built in that you can burn onto a CD and play using your Dreamcast. I've played that more than all my DC games combined.
For Dreamcast, you have to get Spiderman. It was an incredibly fun game (mine stopped working ) that is a must-have for that system. They have the same version for PS1 as well, but I'm biased towards the Dreamcast, since that's what I had. Soul Caliber for the same system was really good (that one stopped working too for me... I lost a few good games on that one.). I haven't played Jet Set Radio, but that looks pretty good too.
-Legacy of Kain: Soul Reaver is a pretty radical action adventure game. Definitely give that a go! -Soul Blade is a nice fighting game, if you like that sort of thing. Eventually became Soul Calibur, so it's interesting to see how it began. -Forsaken is a pretty sweet first person game that's HELLA FUN in multiplayer. Can't really think of anything to compare it to, but it's still pretty good by today's standards! -Roll Cage 2 is a VERY underrated racing game that really deserves more love than it got. Seriously, there's so much in this game that's so fun and enjoyable it's a damn shame it hasn't got a remake or another sequel.