I decided to go with Castle Creation's BEC Switching Regulator on my E Revo.
It looks like a pretty good setup. On 4S Lipo, it should help to take heat/load off the ESC even after I install the 125 Amp Monster Pro.
http://www.castlecreations.com/products/cc_bec.html
Anyone had any experience with this one?
I know JohnRob did a pretty impressive video with it.