I have a 2003 K1200GT in pale green, with all the extras.
Its a great bike, but a bit heavy on the wrists when on minor roads. It also has too many gears as once on the move you just shift up to 5th and let it burble along. It will happily pull 4th at 30mph. 6th is fine at 50 and above.
Like the others, I love my 1150GSA but the 'K' has that great power rush. 130bhp and a yowling airbox can bring out the hooligan in you if you are not careful. It is very comfortable on a long ride, I once did 907 miles in 24 hours and could happily have continued (mind you, I have also done 1,034 in 20 hrs on the 1150GSA recently and those seats are not renowned for comfort).
The red line is around 9,000 (without going out to the garage to check) and I have never been near that so it isn't a howling sports bike.
I get around 42mpg on motorways and have had 54mpg around the Yorkshire Dales. The 21litre tank is a bit small - the low warning light comes on at around 160 and 200 miles can be squeezed if you are careful.
I was recently quoted £5,500 trade-in against a new 'GT' - but I don't know what that equates to when selling on the open market. One like mine is currently advertised at £6,000 but the actual selling price will undoubtedly be lower. Mine has 26,000 miles on it now.
It hasn't done much recently . . I bought the 1150GSA on 30th June and have since put 10,300 miles on it so maybe the 'K' will have to go. Decisions, Decisions.
Great bike though.