GT1 came bundled with my first ps1
Starter car: trueno/leven HAHA (Loved toyota but hated the old supras tail lights and hated FF with a passion so there wasn't many options and the miata was girly)
Favorite car: Blue stripe Dodge viper. Thing would power slide every corner so the replays looked cool.
GT2 came bundled with my second ps1 as the first died.
Same starter car.
Favorite car. black/dark gray Altezza touring car. For the same reason as the viper.
GT3. Yes also free bundled with my ps2
Same starter.
Favorite car: Bright yellow Toyota Altezza. Special stage route 5 S turns before the final corner I could go through at a perfect 90 degree just skinning the nose and tail on the appropriate walls. The walls have been moved for gt4 and 5 so it's no longer possible though

(also I "may" be mixing my GT2 and GT3 cars up here)
GT4 I had to buy this one but did get the network adapter with ps2 lol
Same starter.
Favorite car: 90's Mazda RX7 on Midfield raceway. Fun course to drift now learning what a drift then was. But I had been doing it in all the other GT's anyways because the AI was slow and it made the replays look good.
GT5 again had to buy but 60gb ps3 came with a mail in coupon for 5 free blue rays 👍
Figured I would continue my starter tradition. (Who knew that junker would be so popular..)
Favorite car: Mazda RX7 spirit R seems to be taking it but that may change.
It's too bad Toyota killed off every sports car in the line up

Of course there is a whole list of others I must have in my garage but those would be the ones with most miles put on em in each game just because I liked the car at the time. Even now I don't use FF cars unless forced to for events LOL