Either bike would serve you well, they're both great. I ride the 650, myself. A few things steered me towards the 650 over the 1000 (a little cheaper, a little better gas mileage, tends to come out a little better in reviews, and seems to be a better sorted package out of the box) but there were two things that decided it for me.
First, I wanted to be able to ride off-road and the 650 is better for that because it's about 40 lbs. lighter. However, the main deciding factor was the fact that my wife is scared of motorcycles, so I know that 99% of my riding would be solo. The few times I've had her on the bike, it handled it just fine. But if I did a lot of two-up riding, I would have gone with the bigger bike.
So I would ride both at the speedway during Bike Week and ask myself how often would I be carrying a pillion, and do I want to do any off-roading?
- Jet Jaguar
It's not an adventure unless you need a tent, a passport, and a leather glove for your shooting hand.