There are lots of good guides and outfitters a plenty of people here that know more than me.
Here's my 2 cents....I went with Tom Shankster of Alaska Trophy Hunts this past fall and had a great hunt. Tom is a donor to to GSCO and all around good guy.
Check out gatewayguiding.com. They hunt in the Brooks Range. Were advertising a mid-August hunt a couple of weeks ago and indicated some September hunts when at the convention in Tunica. They took a 45" ram in the Brooks about 4-5 years ago. I would be interested in what you put together and how it comes out. I can be contacted at oregoncarl@aol.com.
If you are still looking for a sheep hunt in Alaska I currently have openings in 2009 for Dall Sheep in the Brooks Range the hunt takes place in ANWAR. There are only limited hunts but taking some very nice trophies. call any time 337-212-4712 or e-mail info@lakhuntingadventures.com for more information