My parents are looking for their first jet sled and are wondering about the bottom contour. is there much diffrences between a 10 degree and 12 degree bottom? how shallow can one run? they are also looking to use it in lakes and limited sound use. they have been looking at 19 ft alumawelds and willies i think. also where is a good plase to see boats besides online? they went to 3 rivers already. we are in the north end. thanks.