Well, currently I have:
1. PS2
2. PSX
3. N64
4. Dreamcast
5. SNES
6. Genesis
7. Atari 2600
8. NES
9. Game Boy
10. Game Boy Advance
I've owned, but got rid of:
1. Sega CD
2. Odyssey 2
3. The Sega Game Gear)
4. Those crappy Tiger hand-helds (Baseball, Football, etc.)
My Dreamcast...