If you go west or southwest, you will run into curves. For myself, I would get a used BMW K1200S like this one for only $6K:
http://denver.craigslist.org/mcd/4279226365.html. But the magazines really like the BMW K1600GT for sport touring. For luxury touring, they like the BMW K1600GTL, but it's like $25K. I test rode a 1200S and really liked it, especially the ESA suspension.