If you are going to race micros the gt14b is the way to go. Just add lipo, change the pinion maybe springs and oil and off you go.
You can buy hopups but they arent really needed. Fantastic brushless system included. Youtube has some footage from the ukmicrox. The speeds are awesome.
You might find you like racing micro indoors instead of freezing your buds balls off.
Maybe some of your members wont like it, but im sure one wont be missed.