The N64. The one system everyone, their moms, and their family pets owned.
I have a lot of good memories of this system, most notably of the following games:
WCW/NWO Revenge (Which really stood out as a superior game to the shit Akklame was putting out with the WWF games.)
Starcraft 64 (The first time I played I thought Overlords could attack and sent like, 20 of them against the enemy. Somehow I did better that game than my friend, who lives for that game.)
Star Fox 64 (The first N64 game I had.)
Smash Bros. (It never gets old. Well, until you play the other one.)
Diddy Kong Racing (For being the shittiest N64 game I played outside of Pokemon Snap)
Goldeneye (I'd play a Goldeneye tourney over Halo anytime.)
Turok (For suckinjg and being cool at the same time. The glitch in Rage Wars was so gay.)
Duke Nukem (Forever!)
Rainbow Six (For being another good port. Those games are fun in a realistic sense.)
Clayfighter 63 1/3 (For fucking up three franchises at once, something I'd have thought impossible.