I do not recall anyone making an upgraded 2-in-1 compatible ESC/receiver. Those 2-in-1 electronics do, I guess, save on space, but when one part fails...

. Just like those motors with the speed control built in... they have their place, but I'm not a fan. And if you do decide on getting separate components, getting another receiver will also mean getting another servo, because of the whole 5 wire vs. 3 wire servo thing. Is there a way to make a 5 wire servo work on a regular receiver that uses a signal, pos +, and neg- wires?