I didn't include handhelds, really...that would make the list too unwieldy.
My list:
NES (the old one is really beat-up and doesn't really work anymore but I bought one of the remodeled ones that came out later on, only cost me $50...I also own a Famicom clone, but have no games for it - I won it at a UFO Catcher machine, lol)
SNES
Genesis
Sega CD
TurboGrafx-16 & CD (but both of those might be sold to Himu soon)
Sega Saturn (my all-time favorite console)
Nintendo 64 (I have like four games for it, and I bought it used for $30, lol)
Sega Dreamcast (R.I.P., you died too young my love)
PlayStation 2 (the greatest console of all time, slayer of the Dreamcast)
Gamecube (bought it used for $70, I only own Tales of Symphonia, Wind Waker, Paper Mario, Viewtiful Joe, and the Zelda compilation discs)
Haven't felt the urge to go into next-gen yet.
As for handhelds:
Game Boy
Game Boy Advance SP (had a regular GBA but traded it in)
DS Lite
PSP
Neo Geo Pocket Color (incredible little machine

)
Game Gear