I ride a R1200C, 99% on paved roads but some gravel or hard sand is no problem.
You must keep in mind that it has road tires and not the groundclearance of a GS type but for most normaly maintained roads, paved or gravel, it will do fine.
The R1200C has only 61hp but the torque is 98Nm at only 3000 rpm and I like that for touring, with or without luggage. With a low center of gravity and the wide handlebars, it's easy to handle.
It has a 17,5 liter tank and I ride 250km until the fuel light warns me to look for a gasstation but is has about 50km reserve. (my average fuel consumption is 1 liter at 19 km)
A nice advantage is that most people, also non-bikers, love this bike. Last week I was touring in Belgium and stopped to look at my map and someone came out of his house to tell me how much he liked my bike :-) It is a nice way to get in touch with locals.
[This message has been edited by jkrijt (edited 15 July 2005).]