Oomp

I'm going to be picking up my Norco Sasquatch in a few days, and I was wondering what I should look for in terms of sizing. I'm 6'1 and 185 lbs (will probably go down to about 175-170 after riding for a month or so and I would call that fit). I seem to be a decently crazy person and though I'm not the greatest rider right now I'm sure that I'll graduate to some of the more difficult North Shore courses with some time. The bike will be with me for quite a while and I was wondering what I should look for when I pick out the size. I guess I'll base a lot of it on comfort but I was wondering what kind of measurements I should be looking at?