I have been collecting ROM files for ages. Now I have all of my emulators with complete ROM packs - including ROM hacks - for NES, Famicom - Translated, SNES, Vectrex, Virtual Boy, Commodore 64, MAME, Atari 2600, 5200, 7800, Jaguar, Lynx, Genesis, Saturn, Gamecube, N64, Gameboy, Spectrum, Neo Geo and more.
It is all packaged into one frontend, complete with box art for every single game.
What should I play?
Perfect Dark is definitely on my list. I'm having some trouble with my N64 controller at the moment though, so it'll have to wait.
I have never really played any SEGA stuff outside of the Sonic games. I had a Dreamcast when I was a kid but I struggled with the ridiculous size of the controller and didn't bother with it much, so I played Nintendo and Playstation games instead. That was also the reason I didn't get an Xbox, the controller wasn't as insane, but still put me off.
_Sonic 3 and Knuckles _. (Genesis)
Streets of Rage trilogy. (Genesis)
Turok: Dinosaur Hunter and sequels. (N64)
Perfect Dark. (N64)
Advance Wars. (Gameboy)
Final Fantasy: Tactics. (Gameboy)
More suggestions available if you like.