I just got a Castle Creations Phoenix 10 ESC for my CPP. It is smaller and lighter than the E-Flite one and there are more programmable options for it. You don't need a 20 ESC. The max current the motor can handle is 13A. And the Castle Creations is rated at a continous current for 10A, so on bursts it can handle the 13A. I know one person is using it with great results and I am sure if I looked hard enough I could find some more people using it. I should get mine some time next week and will give a review of it. If you want a 20A one I thing one of the cheaper ones you could get is by Hobbywing at Helidirect. Hobbywing has a pretty good rep on their ESC's.

Nick