right now I have a raliegh m80 that I bought in 2002 or so but its kind of heavy and has rim brakes

I want a 29er juicy disc that would be good for general mountain competition which I have not done but would like to try soon. The local shop has scott and trek 29ers. I think they also sell raleigh. With all of they seemingly vast geometries and styles can anyone recommend some specific models that would fit the bill. Thanks a bunch.

I am a 6 foot 165 lb if that makes any difference.