Since you already have a radio, and plan on buying a receiver, why not get a kit? Why spend the money on RTR components you don't plan on using anyway? Pro kits are usually about the same price as RTRs (with the exception of Kyosho) but you get vastly superior components. Not just lighter for racing, but stronger for bashing too.

- Pro version of any of the kits you mentioned (especially the Jammin)
- Steering servo (at least 100oz torque, faster than .15 is good)
- Throttle servo (at least 50oz torque, the faster the better)
- Receiver (you already planned on getting)
- Engine (OS RG is a cheap solid racer, Sportwerks .26 is the best for the dollar if there is no size restriction)
- Pipe Jammin JP-1 or 2 are popular choices
- Starter box (OFNA Chrome Top is popular, but any 12 volt heavy duty box will work)
- 6 volt receiver pack (if you aren't using the one out of the Revo)
- 30% nitro fuel (why use anything less powerful than what you can get away with?)