Im a bit of a collector myself!
Atari 2600
Vectrex
Intellevision
Colecovision
Sega Master System
Nintendo
Game Gear
Game Boy (every version.. normal, color, advance, SP, DS)
Super Nintendo
Sega Genesis
32X
Playstation 1
Sega Saturn
Sega Dreamcast
Nintendo 64
Playstation 2
PSP
Gamecube
Xbox
I do not have any of the next gen systems yet, but Im sure I will have all of them soon. I also do not have a jaguar or 3DO, or Neo Geo of any kind.