Apple2Forever: I started out on an Apple //e, and I still have an Apple IIgs which I play on occasionally.
I had plenty of contact with a friend's Atari console back in 1982. I barely remember the console itself, since I was more interested in the game, so I won't definitely say what it was.
After that I had with a few other systems from Amstrad and PC from Multitech, but the very first I actually owned, was an Atari 520STf. With an external 3.5" DD and great all around experience. I bought it in Summer of 1987.