[Hectic]

id say if yer runnin lipo alrdy just stick with the 15-20c ones till somethin fails (probably the trigger) then get a FET then run it till somethin else breaks then replace it, once you gotta do gears or a piston then beef the hellout of it and run 11.1 50c if thats yer sort of thing or keep it on the 15-20 or even 30 and it should still be reliable.
Also id say for a budget go with a black case JG box or who cares about price go with a Lonex, i think doller for doller the are beter then systema boxes. I feel there "regular aeg" gearboxes are just tryin to cash in on the PTW name from those who hear "systema revolution gearbox" and think they are gonna turn there aeg into a PTW with a nom ptw gearbox cause it bears the sestema name.