The 3D0 interests me. I keep meaning to pick one up (right after that 7800); I'm sure it can't be worse than the playstation. But it can't be as good as the Saturn.
I hate to break it to you but the 3DO, no matter what anyone says here, was a piece of a shit, and it still is. The only game I can imagine playing on it in the year 2007 is Return Fire (and the Maps of Death expansion) because I prefer the iconic Willys MB to a stupid Hummer in the PS version.
I'm a hardcore Saturn fan and I didn't buy my Playstation until 2002, but the truth is that the system had such a massive library that it accidentally ended up hosting, at the very least, 30-40 good titles, which is ten times the quality library of the 3DO.
People who defend the 3DO are the same sort that defend the Jag (although even the 3DO is better than the Jag, if for no other reason that it having Policenauts). It takes a severe politically motivated slant to defend garbage like that. Even the games that were in fact worth playing at the time, such as SSFIIX, SamShow, and Policenauts were later (or previously) made availible on other systems as superior versions. SamShow has horrible sound for some reason, SFII has no parallax, etc.
Also, that virtual house game as the worst loading time of any game on any system in history.
If you'd like a list of PS exclusive games a Saturn lover would totally dig:
Gunners Heaven (JP)
Super Robot Wars Alpha (JP)
Love and Destroy (JP)
Zeta Gundam (JP)
The Italian Job (US)
Any of the Gundam Battle Master/Battle Assault series. I would recommend the US release, Gundam: Battle Assault 2.
Choro Q 3 (or 1, or 2 for that matter)
The entire Point Blank series
Eretzvaju (JP)
Power Shovel (I think there is a US release)
Remote Control Dandy
Touge Max G (JP)
Asuka 120% Burning Fest. Final (JP)
Gamera 2000 (JP)
Tobal 2 (JP)
RC Stunt Copter (US)
RD de Go! (US)
I.Q. Intelligent Qube (I think there is a US version, not sure)
And a crapload more. Notice I didn't mention Turismo, FF, RE, or any of that other shit. Those are all PS exclusive (I think) and if a US version was available I mentioned it except for Eretzvaju because the US version sucks.
BTW, I was just looking around at this stuff and noticed that evidently a PS version of Radikal Bikers, a game I loved in the arcade, was released in 1999. That is news to me. I'll have to see if its any good...