Our group is facing the same dilemna. Probably many other groups as well. LOL
Everyone wants those walleye, but there just aren't enough choices. We did go to Nosbonsing one year. I won't mention the place, it was terrible. We did catch the odd pike and small walleye. I caught the two best walleye when everyone else packed up and we were about to leave. The weather will play a role in our decision. The last thing we want to do is book off time and plan a Quinte trip, only to find the conditions are unsafe.
So really, the choices are Nipissing, Temagami or Nosbonsing for ice bungalows or cottage/hut rentals. Bark Lake in Barry's Bay could be an option, but again the weather conditions play a huge role in that deep lake's freeze up. Not sure about the walleye fishing in the winter though, probably more trout and whitefish. Good luck in your search; I have been looking for other options for years. I did call that place on Oak Lake, but no body ever returns the call when I left a message.