This year we cooked a couple of Goldeneye ducks and a couple of Red Heads which were more common this year in Western Canada. They were excellent table fare far better eating than puddle ducks like Widgeon or Gadwalls.
Dove Commander, The Ring Neck(or Black Jack) as they are refered to in Lousiana and lower Ark. are a first cousin to the Scaup(or Blue Bill). Many mistake one for another even thought the Ring Neck has a very pronounced stocky build to it's head. They taste almost exactly the same. The Buffle Head is not bad eating if killed in freshwater rivers or lakes. That is NOT true if the Bufffs are in brackist or salt water.
We usually kill mallards, some blacks, and wood ducks. We let bluebills slide on by. I agree, the wideon and gadwalls aren't all that great. Evidently their not very picky eaters. I had some great Red Head/bluebill stew in Canada, but we seldom see Reds. Good luck with the search!