I am considering an F650GS and was wondering how they handle long trips. Are they comfortable to ride. Do they work well at freeway speeds for extended periods. Duribility? I have an R1150RT right now and like the bike but I want something I can ride on unimproved roads and fire-trails as well as the freeway. I was also considering the R1200GS but I think it might be a little too heavy for some of the terrain that I want to ride on. Any help would be apprceiated.