IMO get a Spektrum radio system ,a MMM esc and Neu 1515 - whatever the 2200kv is,a good set of lipos,and drive the piss out of it :) I'm a upgrade junky,and have yet to find a single item that needed to be upgraded on the Erevo.Most who have highly upgraded started with conversions and needed new chassis and such.If you just have a bunch of money burning a hole in your pocket and want something custom,then start a scratch build.Of course this is MO .