i got the 4600 and it ran fine on 20C 2S lipo's But it does wake up like crazy on my 60C 2S SPC pack. But i would run 2S, not 3S. Reports of the ESC frying on 3S with the 4600KV are everywhere, but on the 3800 you'll be fine. That and the 4600 is a bit cheaper most of the time because it doesnt come with fans, which i would reccomend for the ESC.
"My garden is life itself, in the sense that every aspect of it should be taken care of and tended to as you would a rose, trimming off dead leaves and excess, being left with raw beauty, and perfection in my own mind. " - Jester