Systems I currently own:
NES
RetroUSB AVS - FPGA NES/Famicom system
Famicom Disk System - plugs into my AVS
SNES
N64
Wii
Wii U
Switch
GBA
DS
3DS
PS3
PS4
PSP
PS Vita
XBOX
XBOX 360
OUYA

Systems I used to own:
Atari
Gamecube (gave it to my brother when I got the backwards compatible Wii)
PS2 (Sold it some time after getting a 60GB PS3, though that one has since died and now I play PS2 games via emulation on PC)

Own: Sega Master System USA, Sega CDX, Sega Saturn USA, Sega Saturn JP, Dreamcast PAL, Dreamcast USA, NES model 1 USA, NES model 2 USA, SNES USA, N64 USA, GCN USA, Wii USA, Wii U USA, Switch, PS1 USA, PS1 PAL, PS2 USA, PS3 Super Slim PAL, PS4 Slim PAL, PS TV, OG Xbox Asia, Xbox 360 USA, Xbox One S USA, Atari 2600 USA, Atari 7800 USA, Atari Jaguar USA, GB, GB Color, GBA, DS, DS Lite, 3DS XL USA, 2DS USA, 2xNew 3DS USA.

System used to own:
Neo Geo AES( Sold it everything.. console, joystick & 15 good games including Metal Slug 1 to the enthusiast Neo Geo collector)
3DO(Sold it to the casual 3DO collector)
Famicom(Sold it to the Japanese Nintendo collector)
Super Famicom(Sold it to the hardcore SFC collector)
PS3 80GB(Sold it to the hacker)

Own:
Vectrex
Atari 7800
Gameboy
Virtualboy
Sega Saturn

Gameboy Color

PSP

GBA
DS
GameCube
PS2
Xbox
N-Gage
Xbox 360
PS3
Wii
Xbox One
WiiU
Xbox One X

No Longer Do I Own;
Atari 2600
Intellivision
Vic 20
C64
NES
Sega Master System
SNES
N64
PS1