I would not try to save too much on servos...Just make sure you get reliable proven servos that you can trust espially on the critical surfaces like elevator and aileron... I have had good luck with Hi -Tec Servos Lots of guys use Futaba..I tried them and I just didn't care for how the little rubber grommets attach...The servos worked fine...I think if you can its a good Idea to pick a brand you like and stick to it because then you will have a bunch of arms that are all the same...If you get a bunch of different brands of servos then you have all these different servo arms that dont fit each other..And worse yet some almost fit and then slip when under pressure and your controle surface quits working ..