I'm a total retro purist. The only disc-based system I use with any frequency is my PC Engine Duo, which I love dearly. Finally got a 3DO not too long ago, but I'm pretty unimpressed and probably going to sell it.
The newest systems I own are N64 and PS1, and I don't even leave them hooked up because I just don't enjoy them. Of course it's all preference, but I just really love gaming pre-3D and whatnot. So much creativity in the games, and game music before CD-based systems just really hits me in the right place.
And truly, I'm afraid to get into newer games because there are still SO MANY retro games I want to play through that I may never get through them all. Gotta prioritize!