I live in Idaho, we have an abundace of potatoes and I know families who eat them with dinner every night. Haven't ever heard of people ODing on potatoes.
The daily recommended intake of potassium a day is 3,500 mg's (says this website I just looked at

), any more than that and you do risk stomach upsets, intestinal problems or heart rhythm disorders.
So what's that, like 7 potatoes a day? I think you'll be fine.