Good to know on the No-Bite-Me, I will have to see if it is something that I can use. I can't use deet and some of the perfumy ones, but I really like the Cutter's Advanced made with Picaridin.
I have also had good luck with Vanilla Extract and odd as it may sound Listerine Original mouthwash (I hate the smell of it though!) The only trouble with them is that it seems like I have to renew them more often. Plus I am a bit nervous about using the vanilla in bear country -- don't want to smell too tasty!!
As far as altitude and high country, I camp almost exclusively in areas from 7,000 to 11,000 feet high. The mosquitoes can be really thick up there, depending on the time of year. If you are going into the high country, don't forget your spray!