When you are spending thousands on a jet it is very poor economy in my opinion to try and save a few bucks on servos. Always use the very best servos and batteries available. Wouldn't it be embarassing to build a five thousand dollar jet and lose it because you wanted to save 300 dollars on servos? Remember, reliability and durability are the single most important factor in this hobby. An RC jet is of absolutely no use to you and certainly no fun if it is grounded or crashes due to equipment failure or malfunction. In addition to my HotSpot (equipped with JR 8411's and Volz servos) I also fly a 200+ mph Jett FIRE 50 powered Diamond Dust. It is worth less than 500 dollars but I use 75 dollar JR 8101's on the elevons. I had cheaper FMA coreless servos on it but the bearings quickly failed due to the extreme loads, and it only has a 34" wingspan! When it comes to servos for extreme performance RC aircraft cheaper is definitely not better!