Dave
Hitachi DB3DL all the way!
Very popular with the nitro boys and critically for us tenth scalers has a variable torque control, do not buy anything without torque control otherwise you will strip stuff, guaranteed!
http://tooltray.com/Rechargable-Scre...FUQe4QoduHhnrg
And there are several RC manufacturers that do tips for these tools such as:
http://www.racing-cars.com/pp/Manufa.../ED500801.html
http://www.racing-cars.com/pp/Manufa.../ED500901.html
http://www.racing-cars.com/pp/Manufa.../ED500902.html
amongst others!