It depends on what your going to be doing with it. It sounds like your going to be racing seeing that you got a b44. The b44 is one of the best if not best in its class. So I say you need to get the best you can for it. You can pick up a gtb with motor for around 165.00 to 200.00 depending on options and wear. I wouldn't go with a brushed system because its to much work compared to the brushless..... Trust me you will be happy once you get the right stuff. Also any spectrum will be nice. Search before you hop on something, its amazing what deals you can get on here.