Well I'm a JR person, so better for Futaba users to answer re: servos, but would say that although Hitec have improved a lot, and are fine for 3D(With the best selection of sturdy arms out there), they're not quite there yet for serious pattern use.
Re:Rx
battery capacity it seems to depend mostly on engine type---electric needs the least per flight, 4/strokes the most, and 2/strokes in between.
I managed on a 600mAH nickel metal hydride with a 2stroke, BUT recharged with a sophisticated field charger after every flight---on a windy day a prelim FAI schedule would use around 200mAH.
Nowadays I use an 1100 mAH nimi with a claimed 20C burst discharge capacity,and can manage 4 comp flights without problem, and no discernible (to me, at least) drop-off in servo performance.