Saturn. Had one for a while, really liked it, but I played the games I wanted to play on it (PD Saga, Dragon Force). I don't see myself ever getting another one, although it is a great console. Also, the Bally Astrocade. I pulled mine out of the closet once every 5 years, played it for a day and that's it. I finally sold it on eBay a couple months ago.
I do still play PS1 games from time to time - for some games the early 3D is a bit jarring at first but you get used to it. There are also a lot of emulator packs and more 2D-ish types of games.
To each their own, but I'm really surprised by peoples' responses here.