I use my SNES system still. It's great for playing classic games man. I'll never get tired of Super Mario All Stars, Donkey Kong, Mario Kart, and any game that uses the Bazooka!
I took my N64 a little while ago too but it didn't do any justice on these new TVs. Only game I play on N64 is GoldenEye but it's so hard to play it now that I'm used to Call of Duty controls lol.
Last month I decided to whip out an old tube TV we had lying around to play GoldenEye. G O L D E N P P 7 baby!