I have a Raleigh M600 and wondering what to do to improve it.

I have gone to Avid BB7 brakes and a Dart fork and Big Kahuna tires (I do Adventure Racing and sometime lots of mud).

After purchasing a Gary Fisher Rig 29, I realized how much of a difference there is between bikes. The fisher is so comfortable and balanced.

Anyways, looking for suggestions to improve the M600.