For me is:
Atari 2600 - Was curious about this E.T. game so bought one console used on eBay for £25.
SNES - Given to me as a gift with one of those "Game Doctors".
N64 - Super Mario 64 sealed the deal, as well as Banjo and Goldeneye.
GCN - Mario was top priority, everything else were afterthoughts.
Wii - Both Mario and Zelda are deciding factors, although RE4 was my first game.
My collection of guides on GameFAQs: Read them here
My latest guide on GameFAQs, for Little King's Story! Read it here