My first was a 1977 Honda CVCC (pre-dated the Civic badge), it ran big balls out until it devoured it's own oil pump.
My favorite car of all time....
Cost no object: Aston Martin DBS, not only because it's an Aston with a 6.0 liter v-12, not only because it debuted in Casino Royale, but because it has that lusty V-12 and it was created for Casino Royale and as a result made it to production because of that starring role.
Cost being an object: Mazda MX-5, no other car offers so much fun for the money paired with bulletproof engineering. Fun can be had with it regardless of year and trim, whether it's stock or aftermarket. It forgives the hamfisted and rewards the talented.
Right now I have a...
1991 Mazda MX-5, turbocharged.
2002 Subaru Impreza WRX.
2004 Mazda 6 hatchback.
2006 Nissan Titan half ton pick up.
Trying to talk my wife into letting me get an Abarth 500 when they come to the U.S. because I can park it in my driveway behind my Titan and no one would see it and think my yard is a sales lot.