I've used the H5000 (sadly, discontinued) with good success.
The newer A5060 appears to be the same basic mechanics, high voltage capable, metal gears, probably a good servo. I heard somewhere that they have been used with good results.
JR 3421's are good servos, have a handful of those in planes.
Older JR 3021 and 3121's still work well, even if they aren't digital servos.