Honda Integra Type R is the fastest for your cash - and you'll need it later on in the A-class events. You'll win easy in this car, so if you prefer a challange - get something like a Ford Focus ST or VW Golf
from reading what you guys wrote in this thread, i went for the focus ST as my first car, so i could have a bit of a challenge. managed it fine tho!
on class B now. got me an evo IX now. about 60k so should be choosing another car tonight!