I like Spektrum Tech, or 2.4 GHZ what have you. What kind of jack am I looking at If I were to upgrade?

Anybody know the prices on those Futaba Servos? And whatever Radio is good now days thats around 200 dollars and is 2.4 ghz.

I think the Servo may be about shot it was used when I got it and I have NO idea what condition it is in. I was thinking the whole time im driving it "My Revo has more steering than this" I will consider getting the Futaba steering and leaving the 650 on throttle. only reason I ask about a better throttle is cause I dont know what a good quick servo is. Jeez I really talk alot...