With that in mind....
RT1200, K1200GT, K1200LT all fit the bill.
The GS and GS Adventure can fit the bill too, but less ammenities.
If you're staying off interstates most of the time, I would lean towards the RT1200, K1200GT for their ammenities, and if you ever want to follow that dirt road, or even poorly surfaced road, then the GS, GS Adventure.
The LT is by far the comfort King for two up, many here are saying the new GT beats it for solo riding.
The GS and Adventure have the go anywhere do anything well, but nothing spectacular attitude, and the RT1200 is a more plush GS, but needs to stay on pavement.
Weight wise the GS is probably the lightest, and probably the tallest.
Performance wise, the GT.
Only you can decide.
I hope I was able to give you some things to consider.
Now go get a test drive or two and enjoy !!
2008 BMW R1200RT 7200 miles
2005 BMW R1200GS 13000 miles (Sold)
2002 Yamaha FZ1 (Sold) 11000 miles
2002 BMW K1200LTC 29900 miles (Sold)
2002 Yamaha VSTAR-650 Silverado (Sold) 9100 miles