If you want to go fast without a lot of maintenance, try brushless. I have had a Novak SS5800 in my XXXT MF2 for about a year and it is the best thing I have done in a long time. I use regular 3300 nimh batteries, but be on the look out for LiPoly packs soon.
Slash 4X4, Bone stock and trying to keep it that way.
PRO MATCH BATTERIES.....THANKS JEFF !!