2002 Mitsubishi Diamante VR-X 4dr Sedan (3.5L 6cyl 4A)
The Mitsubishi Diamante Vr-X is a fun fast ride but since I purchased it I have had to put a lot of money into it... the heater core went around 75k, and it's conveniently place on the firewall so the job itself is a nightmare, I haven't met a Diamante driver past 80k who didn't have to do the same, now I'm having trouble with the 02 sensors, I replaced 3 last year and this year the fourth went. I'd say the car would be worth it if it didn't cost so much to maintain. About 1500$ for the heater core repair and about the same for the o2 sensor work.
Best part is that you don't see this car at every intersection you come to. With a little bit of engine work you can get decent horsepower, and it's a pretty comfortable car to drive.