NES: Hand-me-down from my older brother who had moved onto the SNES when I was like three.
SNES: Again, a hand-me-down when he moved onto the N64 a few years later.
GB: My mum gave me it when she got a GBC in 1998.
N64: Once again, a hand-me-down because he went to college and had nowhere to put it :s
DC: A christmas present in '99. Good times, great console. Sad to see it was the end of SEGA.
GBC: Hand-me-down again when mum got a GBA.
NGC: Birthday present in '01, still my favourite.
GBA: Mum got me one because I wanted Pokemon Ruby and it was half price at some retailer.
PS2: Needed a DVD player.
DS: Christmas '04, got it with The Urbz and Sprung, the DS died six years later D':, but the games are still played regularly.
Wii: Had me excited about the risk Ninty was taking, first one I bought myself. Counting Backwards Compatibility, probably the best console Ninty's ever had.
3DS: Bought it at launch, best handheld Ninty's put out, great games, ambassador program and DS BC, well worth the $350 I sunk into it.