Though not exactly the question you asked, my wife has ridden both the G650GS and the F650GS. She felt that the G650GS had too much vibration and was not comfortable at the end of the day (guys, let's keep this clean and just leave it at that!). She now has a 2012 F650GS with low suspension and low seat and loves it. She has an Aeroflow windscreen and does quite well on the highway when we have to travel the Interstate, though neither of us prefer that route. The 650 does just fine with regard to power/zip on the highway. If you're looking to buy new, I would imagine that the F700GS likely would be comparable. I did see the post about the 800 if you're looking for more power.