one word nitronoob, "synthisized" i am not much into racing anymore but it easier to set one radio for all r/c's be it 2-3 or traxxas or mini-t set them up with one radio,and all your problems with crystals,are gone,you will be alot happier garranteed,now for brands thats all up to your own preferences if you have 10 r/c's get somthing that handles that many,if you less then 5 get something in that range,i personally prefer jr radio's,but your preferences should fit your r/c'ing habits
GD