I love the Saturn. Next to the n64 (about 70 games), my saturn collection (about 90 games) probably has the highest % of quality titles. I'm cleaning up my house at the moment, organizing all my games as well, and was amazed at how many of the saturn games I remember that I enjoyed. Off the top of my head:
dragon force, robo pit, panzer dragoon (1,2, saga), shining force 3, blazing heroes (mysterium), shining wisdom, shining the holy ark, gex (though gex should be played on 3d0 in my opinion), the horde (another 3d0 port, great game, though I haven't actually played the saturn version), fighting vipers, fighters megamix, mega man x4 (far superior to the psone version), bug, bug too, clockwork night, sonic megamix (or collection or whatever it's called), sonic R, mega man 8, albert odyssey, heir of zendor (think that's the name), virtua fighter kids, virtua fighter 1, 2, remix, virtua cop 1 and 2, battle arena toshinden, ura and remix (why did this franchise die?), nights, christmas nights (demo, but still cool), daytona usa & championship edition, and more I can't think of at the moment. I still need to buy magic knight rayearth and burning rangers though.
And I loved the n64 controller, best contoller ever.
I can't really say I regret buying any system (I was every system, so even if I don't like it, it still allows me to cross one more thing off my list). I'd say the least used is neo geo pocket. I like it, but portables make my neck hurt cause the way I have to play them (I can play gba games on my gamecube so I love that system). But I bought that months ago. The system I believe I enjoyed the least and played relatively little (since I'm looking at the games I have for it and I can't remember playing any one them any length of time) would be jaguar CD. Jaguar has some nice games, and battlemorph for the CD is supposed to be great (homebrew released years after the official demise of the system, sold very quickly at about 200-300 from publisher and fetches 3-400 on ebay), but the cd add on isn't very good overall.
Also, anyone wanna dump their tg16 and duo stuff I'll take em, I believe I'm about 7 or 8 tg16 games, 5 or 6 cd games, and 15 or so duo games away from having everything released in the u.s.