well, after chatting with my Dad who used to downrig a lot. He suggested 1 downrigger given the depth changes on the lake where my camp is. I am on Lake Manitou and the depths change from 130 to 80 to 60 very quickly. I was downrigging with a friend last weekend and we each had a rigger set up with a dipsy diver for shallower possibilities and we were constantly raising and lowering the ball with the depth changes.
I decided to go with 1 Scotty stacked and a dipsy diver for now. I'm going to give it a try for a bit and see how I do. If I need/want another i'll buy it. Thanks for the feedback guys!