for me i have a set of Thorp-MIP drivers....
and my wife also into the r/c realm....has her own she uses the HUDY-Profi sets...
same tips as the HUDY pro sets but different handles.....there Plastic instead of Alloy.
the Thorp's are a little more thou..bout 12.00 to 14.00 per wrench....
the HUDY Profi's are around 6.50to 7.50 per wrench.....both are able for replacing the tips..
here's one link hope this can help.......
http://www.bmainhobbies.com/index.php?cPath=106_107