***Facepalm*** totally missed the requirement for an on-road car, sorry about that!
Pretty much any 1/8 Buggy can be ran as an on-road car by simply installing a set of GT8 wheels, however if the OP wants a true dedicated on-road basher, then yeah the selection would definitely shift where my top pick would be XRay, not sure if the electric GT8 was released yet, my second pick would be either Mugen or Serpent.
As far as 1/10 cars go, the options on the market are insane.... my safe bet would still be XRay... I have been burned by racing some off-name brands in the past and having difficulty getting spares from brands like TeamC, SpecR, Atomic, ABC and Xpress. If money is no object and you want the best the market has to offer, then get an Awesomatix, I raced one of those for a while and you definitely get what you pay for with that kit!
In reality if I was gonna bash, then I'd stick with 1/8.