Kit to Get!!
At the present time, if you want a nitro sedan that is fast out the box with very few changes out of the box, you should get the XRay NT1,, Kyosho V1RRR EVO, or Mugen MTX-4R. These kits can be built and raced at the top level without alot of work and upgrading on the car.
Serpent 748/Matrix Tires/Novarossi
Serpent America/Desoto Racing
Murnan Modified Motors