N64 I bought it at launch for Zelda which kept getting pushed back I was sick of Mario 64 and Mario Kart and traded it for the PSX
PSX Got in trade to a friend for a N64 and never looked back.
PS2 I knew it was an out of the box DVD player and was reverse compatible with my PSX games so I had to get one.
GBA SP I needed a portable gaming fix back in the days before the PSP
PSP As soon as I found out you could run emulators and homebrew on it I got one this was shortly after launch of the system.
Dreamcast inspired by this site which I originally found in my quest to learn all about PSP Emulation and Homebrew I purchased one after finding out it could run CDR's without a mod chip have about 100 games for it now.
Saturn Love of RPG's made me purchase this console which I have modded and have around 50 games for so far.
Wii I purchased this for Zelda. After Nintendo screwed me at the N64 launch I've finally given them another chance. Also knowing that it was backwards compatible with the GameCube I picked up a controller, memory card and the Legend of Zelda Collection from the Gamecube.