When I was a wee lad(4 years, which is the extent as far back as my memories go), my family had both an NES and some brand of PC.
Here is the full list of what I've had and/or still have. SH = Still Have, DHA = Don't Have Anymore.
NES(SH)
Gameboy-"the grey brick"(SH)
SNES(SH)
SNES-101 The remodel of the original(SH)
2 Gameboy Colors(SH)
N64(SH)
Gameboy Advance(SH)
Gamecube(DHA, gave to a good friend)
Wii(SH, the reason I gave my friend the Gamecube, since my Wii plays the GC games.)
DS Lite(SH)
PSP(SH, Won it by getting second place in the big final top player poker club tourney at my first university)
360(SH)
Retron 3(SH), so I can give my NES and SNES rests, and play Genesis games I've been collecting.
PC(using right now, it is a four year old Dell Inspiron 530, can only the most basic of new games, basically some indies, and MMOs at medium to high graphical look, depending on the MMO.)
Next Gen is a toss up, it depends on what I have the money for, this last gen I started a trend of getting at least two of the competing consoles.
All things considered, I'll most likely get the Wii U first, then in a few years, I'll get the one out of the other two that my friends lean towards, cause they aren't big Nintendo gamers.
The why I got them on the console list, the Nintendo saturation is because in the beginning, all I knew was Nintendo and I grew up with it. Heck, when I went on a family vacation to visit my aunt, uncle and cousins, during the early 90's when I had had a SNES for about a year, one of my cousins said when I asked him if he had video games, "Yeah, I have a Sega Genesis with Sonic and some other games", I said, "What the heck is a Sega Genesis?" Also the equivalent of this video in cute little kid terminology, oh, and with no fake cocaine(flour) on my face:
The 360, I got that a year or so after the Wii, because all my friends were getting 360s.