SCQTT (still haven't figured out the Q or your locationary confusion) - I'm not saying the GS can't perform, but the seating position isn't the same and the feel is very different. The GS and RT are much more similar from and ergo standpoint. I prefer my feet a bit farther back and my hands farther forward. As for the bring a bike of my choosing, my selection is limited... I only have one bike to ride (unlike your stable) and it is the R1100RS. I also know full well that the bike is 20% and the rider is 80%. There are a lot of guys (and gals) who could probably drop me on a fun foad on a F650GS, nevermind a R1200GS. Nonetheless, for a street bike, I don't want a GS or RT or S. I'd take an ST, but my knees would hurt a bit more.
Regardless, if you are up for a long day, I've got a 450+ mile route mapped out starting in Lodi and heading to the Ohio river for lunch. Some of the roads are better suited to a GS than an RS, but I think it will be a fun loop