What servos ?
i use all JR: i have a 8700G on tail, 4721 on pitch, 4735 on ail/elv and throttle.
you can go cheaper on throttle if you want, one of your hitecs (i have a fast servo there because of my governor) just remember if your throttle servo goes you might burn your engine, kind of unlikley though...
you can go cheaper as well on tail, even a 4735 will give you good performance on you tail... i just got the combo 550T&8700G...