novak/lrp/nosram all do really good brushless esc's and motors, were all moving onto lipo batteries now or if you want more nimh cells then you'll want some 4200's or 4600's
B4 and X6 are both awsome cars still the kyosho RB5 is also starting to become quite popular among some of the top drivers so that might be another car to think about, the X6 will cost you a fair bit more but you won't be disapointed which ever car you go for there all top spec