Huckleberries nad blueberries indeed require acidic soil.
Haskap berry is quite undemanding plant if You have a sunny spot for it, otherwise they can get bitter. Pick modern Canadian or Russian variety. They are much better then couple year ago.
Suskatoon - if You like birds
Very sweet. They require space, and some pruning. Pick grafted variety or atleast one that doesnt produce alot of suckers.
Currants are very easy plants, they give fruits every year with almost no care. Except if You wish kids will like it You might be dissapointed. They healthy but also very sour. But if you mix them up with something sweet thats a nice combination in kitchen.
I live in zone 6b - these 3 work for me + strawberries!