Being that you already have a PlayStation, then you already have access to 99% of what the 32-bit generation had to offer. There are some interesting Saturn exclusives (mainly Sega's own releases, like Panzer Dragoon, NiGHTS, Virtua Fighter, etc), and things get better if you don't mind doing some importing, but I would say you're better off skipping this one.
Personally, I like the N64. People give it crap for not having any good games, but the truth is that there are plenty of games to make it worthwhile, even if all you get are Nintendo's own releases.... Ocarina of Time, Goldeneye, Super Mario 64, Turok, Conker's Bad Fur Day, Perfect Dark, Jet Force Gemini, Banjo Kazooie, Starfox 64, F-Zero X, and the list goes on.Nintendo 64
One thing you need to keep in mind though is that most used N64 controllers are beat to hell. If you're buying controllers, make sure the analog stick isn't loose and floppy, or you're not going to have a lot of fun.
Don't even think about buying one. Don't get me wrong, it's a great system with some great games... but it's just a giant money sink. Do yourself a favour and stick with emulation here. Get a nice arcade stick if you like.Neo Geo
If you don't mind importing games, and waiting through some load times... then the Neo Geo CD is a bit more palletable.
Absolutely, yes. The Dreamcast was an awesome system, and the king of niche gameplay. Plenty of unusual games like Shenmue, Jet Set Radio, Floigan Brothers, Space Channel 5, Crazy Taxi, Illbleed, and Bangai-O.... All of the best fighting games of the time, like Street Fighter 3, Street Fighter Alpha 3, Marvel vs Capcom 2, Fatal Fury Mark of the Wolves, Vampire Chronicles (import), SoulCalibur, Project Justice, and Jojo's Bizarre Adventure.... Lots of excellent shooters like Mars Matrix, Ikaruga (import), Border Down (import), Zero Gunner 2 (import), Gunbird 2, and Giga Wing.... RPG's like Grandia II, and Skies of Arcadia.... Racing games like Sega Rally, Metropolis Street Racer, Re-Volt, San Francisco Rush 2049, and Speed Devils.... arcade ports like Hydro Thunder, House of the Dead 2, Virtual-On, Daytona USA, and Silent Scope.... puzzle games like Chu Chu Rocket, Mr Driller, and Super Puzzle Fighter 2 Turbo (import).... and even some of the best sports games of the time, like Virtua Tennis and the whole 2K series. The Dreamcast may not have lasted long, but it got a surprisingly deep library of games.Sega Dreamcast
If you had a PS2, then you can probably skip this one. Nintendo made some excellent games for the Cube, but it didn't get nearly as many good 3rd party releases as the N64 did, so if you're not into Mario and Zelda and co, you might not find a lot to interest you here. If anything, I'd say get a Wii instead, as it'll play all GameCube games, and then you also get access to games like No More Heroes, MadWorld, Zack & Wiki, and more.Nintendo GameCube
--Zero