I think Matt hit the nail on the head.

I have shot the 03 BK2 tall and almost traded my 03 Pat Dually if I had of taken one more shot I would have traded for sure.

It is one sweet shooting bow and deadly accurate.
But it is hard to beat the brace height of the Pat Dually and the speed and power it puts out.

If you are new to Bow hunting then do as Matt suggested go with the Pat Dually but get the 60lb limbs as the 70lbers are a bear to pull back and besides with what the 60 puts out there is no game animal in Nth America that it wont take.
Plus you will be doing your shoulders a huge favour.