there are also some budget engines that will really do the job well. LRP engines are good and are super reliable as well as some dynamite motors such as a mach 427 (losi also makes a mach 427) the picco engines are good as well and even better if you get one modified.

if i were to pick a race engine it would be something by os. they are pretty top notch. rb and nova are nice but its hard to get those parts sometimes.