Velineon is bottom of the barrel electronics. They come with the RTR kits because they dont cost that much, and are kind of cheap especially when compared to the aftermarket.

I would suggest buying a HV system, like the Mamba Max, or the Tekin RX8. You will have one esc and one motor, just larger. It will have more power, cost less, and is better in the long run.

Sell your motors on ebay to offset the cost.

The problem with buying used Velineon's on ebay, is that your buying lower end electronics, that some one else has already used and decided it needed to be replaced in there truck or buggy.

Look at the new BL eMaxx on the Traxxas site. Im sure it will help.