So you're interested in getting a "high-voltage" servo? And the MMP has a programable BEC voltage? If you're looking to up the servo voltage, be careful you don't blow your receiver. Savox servos suck a ton of current. I think Hitec make better servos. Your Wraith weighs 5.5lbs, so I don't think a cheap $15 servo is gonna do it. And stock RTR servos are notoriously sketchy, not worthy of replacement. You're gonna have to suck it up and buy a really decent servo, one with all metal gears and at least 150oz/in of torque, so it's built to last. So I still think you're going to be near the $50 mark to achieve that reliability you're looking for.