The best prophy handpiece is the Integrity II, which is also sold under other brands on ebay. This is the one we use most. My rdh loves it. It's actually got enough torque for restorative dentistry too. Just slap on a $15 e type contra angle when needed. (affiliate link)
https://rover.ebay.com/rover/1/711-53200-19255-0/1?mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F264889665423&campid=5337908077&toolid=10001&customid=
