Still own a Sega CD and SMS (and Sega 32X). Never owned the VB, but played it once (got a headache). Of course I've been gaming most of my 36 years, so that isn't so unique I suppose. I remember buying a Japanese adapter for my Sega Game Gear that let me play my old SMS games on the go.
Good times, good times.
I even played the Maganvox Odyssey at my Grandparent's house when I was a wee one. I also recall desperately wanting a Vectrex for christmas, but not receiving one (probably a good thing..bzzzzzzt).
Let's see: consoles & handhelds I've owned (and still own, albeit in storage):
2600
NES
SMS
Genesis/32X/CD
SNES
Gameboy (original/color/advance/SP)
Game Gear
PS1
Saturn
Dreamcast
PS2
N64
Gamecube
Still play:
Wii
XBox
XB360
DS (and DSLite)
...and that's not counting computers I've had. Still, my collection is far from complete as I've not been obsesive about it. I'd like to go back and get some of the systems I've missed, but can't find them at a suitable price in 2nd hand stores, garage sales, eBay, or Craigslist.
Thinking back, while I'm still nostyalgic and would not dream of parting with my collection, I've never enjoyed a system more than my 360.