I was able to find:
HPI Racing Sprint 2 Flux RTR w/Ford Mustang GT-R
Must be the same or similar. I looked at the specs and replacement parts and was able to find a picture of the ESC. Indeed it is a standard 3 wire servo cable config. So I assume the RX has the same 3 times 3 pin headers on it to plug the servo cables into it. This is good, cuz most (cheap) models have a custom control system to save cost and is next to impossible to figure out.
You said the RX has 3 channels but only uses 2. That's also good. You can use the 3rd channel for auto/manual detection.
The power to the RX is likely being provided by the servo cable from the ESC. The ground and power pins on the RX are on a bus. You only have to provide one channel to power all. So when you run the servo cable from the unused RX channel to the board, you will have 5 volts (check it) and ground available on the cable to power the board. This power should be fine in terms of conditioning. It is the raw main battery that is dirty.
Here are some sites to look at for parts... there are many more:
http://www.rentron.com/index.html
http://www.sparkfun.com/commerce/categories.php
http://www.parallax.com/
http://www.pololu.com/
Here is an overview of the ICSP I discussed.
http://www.embedinc.com/picprg/icsp.htm
Best,
John
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