Here is what I have in my collection:
Atari SuperPong
Atari 2600
Jaguar
Turbografx 16
NES (original and top loading model)
SNES
N64
Gamecube (black)
Wii (white)
Gameboy (original)
Gameboy Advance SP (classic NES edition)
Gameboy Micro
Nintendo DS (original gray model)
Genesis (all 3 models)
Sega CD (both models)
32x
Saturn
Dreamcast (black Sega Sports edition)
Playstation (original and PSone)
Playstation 2 (original and slim model)
Playstation 3 (slim model with 320gb hard drive)
xbox (green Halo edition modded with xecuter 3, 250gb hd, and IR power on/off module, two black ones modded with duox chips and 80gb hard drives)
xbox 360 (original white model without HDMI, with 120gb hd upgrade)
and here are cool/interesting accessories/add ons:
NES: Satellite 4 player adapter
SNES: Mario Paint w/ mouse, Lethal Enforcers guns
N64: memory expansion pack, racing wheel
Gamecube: gameboy player
Wii: balance board
Genesis: SegaCD, 32x, Lethal enforcers guns
Saturn: Lightgun
Dreamcast: keyboard and mouse, vga adapter
Playstation: Guncon
Playstation 2: Guncon 2, Guitar hero guitars
Xbox: Steel Battalion
Xbox 360: Kinect, rock band/guitar hero instruments
x-arcade joystick with playstation/gamecube/xbox/dreamcast adapters.
all of my consoles are in decent working condition, with exception of the Jaguar. i bought it at a flea market for $10 with 3 games, however it very rarely ever works. it usually just turns on, the screen turns red and it locks up. after alot of tries, it will eventually work. most of my systems are packed away right now, i currently have the PS2, PS3, Xbox, 360, and Wii connected and ready for use. the ps2 is in my showcase cabinet for lightgun games, the 3 xboxes are pretty much used only for xbmc and emulators.