So....

I've got bit by the dual sport bug but I want to take it a little further.  I want to race in Enduro's or Hare scrambles and  would like some info about it (I have even started a new workout to accomdate the physical aspects of racing).  It sounds fun, and for the most part, cheap (cheaper than road racing).  Now, will a 250cc 4 stroke keep me competitive, or am I better off with a smoker?  I'm thinking of a KTM 300 2 stroke, which I can get plated for some crazy dual sport fun.  I need a bike that is forgiving while I gain more experience, but at the same time, it needs to keep me competitive.  Lastly, with enduro racing, will a 2 smoke be fuel effecient enough for the race?  Help me  

Angelo [moto]