I also have never hunted sheep... have been up after goats.. but in areas where there is no sheep.
From what I have heard, the brooks is still the best place, but that is fly in, from a guide who knows the area, and won't get you lost while you are looking for them. There are a few on the road system.. but finding them is the problem.. Some in the talkeetnas, some on the west side of the harding ice field. Finding them is usually the problem then.
I guess the real person to ask would be the guide, if you have the money like you said before....