Aluminum milled Cases, brushless motor, titanium gears, bearings, a good blend of speed and torque like 250 - 280 oz. and a transit speed of .12 - .08 would be perfect and the price of between $80 - $100 a servo would be awesome. I have some Turnigy servos I use in my buggy and they have a milled upper and middle aluminum cases with enough torque from a coreless motor and I paid $23 a servo. Make a great product that is available for anyone to buy not just the rich and people will buy them don't and you either won't sell any or people will be looking for refunds.