Atari Jaguar. I picked it up on eBay back in 2012. I was on a big retro kick at the time. Was it worth it? In terms of the game library, not really. Tempest 2000 remains one of the best games of the 5th gen, and Alien vs Predator is a lot of fun, but there's not a whole lot after those two. I do think I could easily turn a profit, though, if I sold it today.
Next, I think, is 3DO (FZ-10 model). The Need for Speed and Road Rash are fun, but a lot of the games in the 3DO library are available elsewhere. Not worth it.
After that, Dreamcast. Absolutely worth it. I do think its greatness tends to be slightly exaggerated in gaming circles, but it's a special system with some amazingly stylish games. Honestly, I think it's worth it for SoulCalibur alone.










