For me, 1990 Oldsmobile Cutlass Ciera SL. A fully loaded one, including the FE3 sport suspension. Near identical to the International Series, but it wasn't for some reason. It's the first car we got when my family first landed in Canada. Also my 2002 Cavalier, it's the first car I drove, and I had a big fight with my parents when we got it. And of course, my G6 ;), my first own car.
Here's a list of all our cars (chronological order) and some signficance
1990 Oldsmobile Cutlass Ciera SL - First car in Canada. Primarily drove by my ma, and she constantly brags about the "good ol' days" with it. It was the best car we ever got and nothing really replaced it (well, maybe my G6 will... but so far nothing is better).
1990 Chevrolet Corsica LT - Second sis' car. We had problems with this one. The steering constantly vibrated and we were told it could be something wrong with the suspension that it was incorrectly fitted out of factory. But we ain't no mechanics so we don't know.
1992 Chevrolet Cavalier VL - First sis' car. Originally my sis wanted to get a Tercel, because she was lured by people that imports were good. After test driving and looking at it, it was completely unjustified because we could get a fully loaded Cavalier for the price of a barebone Tercel. Also the only coupe we ever got, and probably will be the only one because of stupid insurance companies. Male driver + 2-door = money pit.
1995 Chevrolet Lumina - Replaced the Ciera because there was major transmission work coming up for it. First car we had with keyless entry. Sold a few years later as our family moved back to Hong Kong.
2002 Chevrolet Cavalier VLX - First car we got when me and my ma came back to Canada. Also the first car I drove. Had a big fight with my parents because I wanted an Alero instead. Still in production, for another few days... Also the first car with insurance exceeding the cost of the car itself.
2006 Pontiac G6 - First time I switched to PBG from CO. Got sick with Chevies, and Olds was gone. Also my first own car purchase. Wasn't a pleasant purchasing experience, but nonetheless I'm getting the car at the end.
As you can see this is how I got hooked onto GM...