Hey Jax2 - you riding a Multistrada? Or a GS? I'm thinking about buying the Multi.
Biomimetic - I ride an R1150GS. I ride off the pavement enough that the advantages are significant over the Duck, not to mention I enjoy servicing my own bike and, in a good year will put 10-12K miles on my bike. I've had two friends who've owned Multi-Strada's. Both said they are a blast on the street but are really not as competent off the tarmac, and are lacking in long-distance comfort (another aspect of riding I enjoy). One of those friends also owns an R1150GS and wouldn't think of substituting one for the other. If he had to own one bike it would be the GS. The other, who is primarily a street rider, ended up selling his after owning it only a few months. YMMV. They sure look and sound great. Regardless, they are different animals. The MS is more of an urban asault vehicle. Cast wheels, fancy cateye headlights and lower ground clearence will not hold up well to the punishment of dirt roads...IMO. The GS is more of an all-purpose, Swiss Army Knife of bikes. Mind you it is not a trail-bike, but it does pretty darn well on challenging terrain depending on your skill level. If you are doing mostly off-road, then I'd look to a lighter bike that is more suited to that purpose. This is my second GS (my first was an R1100GS). The R12GS Adventurer looks like a nice choice. Rode and R12GS and couldn't find enough advantages to trade-in, and don't like the linked braking system (I think the Adventurer is available without it).
On your audio-related question - To add tubes to a high-end integrated (or any integrated, for that matter), you'd need to have an input that bypasses the preamp section to use a separate tube preamp, or a line-out that bypassed the amp to use an external tube amp. I wonder if there are any integrateds that have sections worthy of such isolation, as there usually is some compromise in squeezing both in one box. On the other hand, there are many nice tube as well as hybrid integrated amps out there to choose from.
Marco