I wish you the best with the new F700GS. We have a F650GS twin in the garage that I have some history with. Considering your mileage on the FJR, I hope you enjoy a wonderful ownership experience.
If you haven't looked around for crash bars or skid plates, just seen what the dealer offers, do peek at the AltRider stuff. And Touratech offers some things too that may appeal to you better than the SWMotec stuff that most BMW dealers sell/push.
My wife added HID headlights and Aux lights to hers. She doesn't use the Aux. lights much, but the HID headlights are a big plus and save a few watts for other farkles like heated gear.
Sadly, there just aren't many bikes out there in the <500 lbs range that are capable touring bikes with seat heights below 32". The wife also has a custom seat with a bull nose treatment to narrow the front of the seat and lower it. It fits her well and helps with the lack of strength, but when fully loaded with side bags and top box, I still valet the bike a lot. She does have the larger aluminum bags though.
Keep in mind that the little GS weight of 427 or so does not include any luggage. By the time you kit it up with bash guards and skid plate, and add three piece luggage you're getting back into the 550 lbs + territory.
I hope they re-designed the center stand for the F700. It was an option on the F650 twin and deploying it sucks with a tiny little ball on the end to get it down, then you have to shift your foot over to the pad where you can get leverage to get the bike up on it. If it's still that design, you might consider some modification to it right off the bat to improve it's use-ability. Perhaps just a welded on bit on the ball and a gusset to give the potential to use that for deployment.
