Keep in mind that July/August will be brutally hot in the western and southern states,
A lot of European tourist fly into the west coast and rent Harley's or motor homes, then tour the western states,
I would recommend you pick up a "national parks passport" ($5) and an annual national parks pass ($60) and try to see as many of our national treasures as possible, with admission to each park around $10-15 the pass will pay for itself real quick (Utah for instance has ten NP)
motels are plentiful I've toured all over the country for years and never made a reservation and rarely had a problem getting a room after learning a few tricks like stopping earlier on Friday Saturday,
For Twisties and awesome riding it's hard to beat northern California/ southern Oregon,
I've never been to Australia so I don't know what you're "used to" but Utah is like riding on another planet,
I would recommend a loop through northern New Mexico/Arizona, southern Utah and Colorado as a must see,
with 6-8 weeks you'd have enough time to make it to the East coast if you wanted to and as suggested Vermont/New Hampshire are gorgeous and so is northern Wisconsin and Michigan,
however the Dakotas, Minnesota or further south the midwestern states like Missouri, Illinois are flat, hot, straight and bo-o-o-ring, eatern states like Massachusets, NY have the worst roads, traffic and drivers.
I can't imagine why "anybody" would want to go to Chicago or NY,
personally I would ride many hours out of the way to avoid anyplace like that.
My wife and I did a trip back in 2006 that I wrote about here
with a lot of pictures to give you some ideas.
So now that we've helped you get "some direction"
your way to "repay" us is by writing about your trip and sharing some of your adventures (with pictures)
with us in the ride tales forum, is that a deal?