Unless cash is really tight I'd avoid anything RTR if racing is gonna be it's use. Sooner or later nearly every single part on the car will need replacing as they are made with inferior quality parts, so when more power is wanted/needed not only do all the electrics need replacing but most of the drivetrain as well.
The new B4.1 does go someway to sorting this problem out, though.
For my 2p I'd but everything secondhand.
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