Corvette ZR1 RM Is an awesome Race Car, and will beat any GT500 class car in the game. Z06 RM is tamer and indeed cheaper than a ready-made RC. If you're leveled up enough to buy them of course. The option, OP, if you have access to Seasonals, is to do 4 or 5 license tests (no more than 5, or you'll lose a chance at 5 cars) and go check your UCD for a used Race Car. After you decide or chance into what you need, go grind the 6 A-Spec online challenges at the 650PP level. If your online bonus is at 200%, that's an avaerage of about 900k credits every 5 laps (or 1 at the Nurb). Just remember most things you do turns 6 cars over in the UCD every time you enter an event. Time trials in Seasonals do not turn the UCD over, Multi-Race Championships turn the UCD 1 cycle (6 cars). And the Seasonals level you up super fast
And CallMeDan: Don't know what dealer you went to, but he called you something else if you payed over a mil for any Vette RM. If you buy the car, go to GTAuto and do the RM, then go do what you can in the Tune Shop with a set of Racing Softs the whole thing doesn't get over 750k, the Z06 comes in under 500k