Well, I appreciate old stuff, but right now the priority is getting there quickly and reliably. I guess I'll end up making an offer on the K. I can wrench. We've got 5 cars/truck and I do all the work myself. I've got an e28 535i for fun & track use, but I dd an e34 540/6. I guess this is the same situation.
I've got (and will be selling) an '82 CB750 Nighthawk right now that I probably shouldn't have bought, but I really liked the "idea" and "feeling" of it. I feel like the R100RS would be a similar purchase, although it's in far better shape than my Honda. I'll end up with another bike at some point. It may be an airhead (don't think I'll be satisfied until I have one) or a new F800GS.
Thanks for the advice. I've been reading on here for months and I knew you guys would help me make the correct decision.