Brushless motors are rated in KV, which is how many RPM's for 1 volt, this allows you to work out the motor RPM by multiplying the KV rating buy 7.2v. Most of the companies are giving their motors different ratings or winding info but they also supply the KV rating, so if you know the KV rating of a motor, you can work out what rating the ESC is.
I think with Brushless, the more you spend, the better the ESC at the moment. Also, you might want to go for a milder motor initialy, and then maybe get a fater brushless motor later, a lot of people I have seen running them in buggies found them hard to gear.
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