This all sounds great!
Really looking forward to more information on the motors. I have to agree with what Randy said about the hotwire. I am a little disappointed that Castle Creations included it with the Mamba Monster. I have 4 of them from Mamba Monster ESC's, and another I bought previously for the Mamba and Mamba Max systems... now I have 6 in total that is a complete waste.
I will definitely be picking up one of the RX8 systems. Do you plan to make different KV and sized motors right from the start?