The RT...
David
Use my 1100RT in town a lot, minus panniers for filtering but with top box and/or tank bag for any baggage. Worst aspect for me is the weight when pushing them around in the garage, but once rolling, no real drawbacks with the size in traffic, you can hustle these bikes along very briskly once you are confident, depends how pushy you are feeling..!!
Out of town, excellent and capable machine, I run Bridgestone 020's and it handles better on twisties than you might imagine. Friend of mine saw last month some German registered RT's being thrown around in the Alps, he was very impressed.
I have had no probs in 18k, Steptoe looks after it and it just runs, I am very pleased with it.
As already mentioned, great weather protection, with heated grips and electric vest on very cold days they are truly an all year round proposition.
I tried the 1150 with 6 speed box and later models had servo assist, not for me. 1200 is something else again but have a look at BMWsporttouring (mentioned previously), its a US site but is the best place for good postings on all the oilhead RT's, tech stuff and riding feedback. Spend some time reading there and then take a long test ride.
Good luck

Charlie