Parokki on 18 July 2007
Very vague memories of the first one, but I've got online auction logs for all the latter ones.
NES - Got from relatives, played a lot, and sold in the years between 1992 and 1998.
GC - Bought one 280406, a few weeks after getting hooked on SSBM.
Wii - An early Yule present on 211206. ^^
Xbox - Borrowed from a friend during around 12/06, ended up buying it for dirt cheap.
Currently negotiating with my girlfriend if she wants to give/sell her old Gameboy and Playstation to me. Might buy a PS2 or a DS, but got far too many games to play as is.
