I've taken Famine's database and tweaked it a bit. First of all, it now reflects the NA/NTSC version with all 721 cars (I believe). Second, it is completely sortable. It contains the following fields:
Country, Make, Source, Availability, Year, Cost, Drivetrain, Cylinders, Displacement, Power, Torque, Mass, Length, and PWR.
The only problem is that I'm only adding data as I can verify it from my own progress through the game, which means that there are quite a few used cars and prize cars for which there is not yet complete information. For the used cars, you can get quite a bit of the information from the used car database that TornadoAlley is working on. However, on the off chance that it might be useful to someone, I'll post it and let you guys decide. I'm open to any suggestions/corrections. Enjoy :-)
Edit: Added some more cars from the used lots (v2)