Should get the HPI A886, it's what I have and has two sets of the spring/tension clips.

Gold = high stall rate
Black = standard stall rate

http://www2.towerhobbies.com/cgi-bin...86&FVPROFIL=++

The HPI A885 is a good set too (but still has a wrap around spring) adjustable stall rate by cutting the clutch shoes.