The Fast and the Furious

Nissan Skyline GT-R V-Spec II. I use this car until I'm 63% done.

the shelby G1500 is fast (240s with nos boost, 210s without) and easy to handle if you want a nice, stable car. its at the US dealership if you have it unlocked

that said, if you can handle it and dont mind drifting most turns the LF-A Concept can approach 300 MPH

if u r looking for the best handled car, i know what is it:
for destination and top speed battle : LF-A concept (u can find it in the Lexus dealership after finishing all of the drift races)
for drifting : Rx-7(this is the best car for drifting, 'cause for the rest of my game, i just have this and never lose a drift battle all my life, so just install the fortune body kit for the best handling)

I always use the corvette zo6 because of its acceleration, topspeed and handling. just a little slippery, but it does the best.