Good Afternoon All-
Honda, Yamaha, and Suzuki are known for their attention-to-detail, build quality, and excellent transmissions. Excellent dealer network. From a cost-to-benefit ratio, one of these would likely be my choice.
Kawasaki builds bulletproof, monster motors with huge horsepower but tends to have switchgear and transmissions that aren't quite as refined as the other manufacturers. Excellent dealer network.
BMW is the king of refinement, but at the expense of horsepower and handling performance. Their motorcycles last forever and actually look cooler twenty-five years later as classics. Outstanding dealer network and the unique BMW Anonymous directory for afficianados and assistance throughout the country.
Moto Guzzi, Ducati, and Triumph are all very slick imported bikes. They clearly don't have the reliability of the Japanese or German marques, which most people understand. They have a soul and spirit that is undeniable, but I don't know if that will provide any comfort on the side of a windblown highway with approaching thunderclouds!

They are probably the most fun to ride and will attract the most attention parked at the cafe.
With that all that said...I would tend towards the Honda, Yamaha, and Suzuki models for fun and reliable motorcycling. The aftermarket is chock-full of companies who make accessories and other things for these bikes to make it even more enjoyable. Check back into this thread and let us know how you're doing with this decision.
~ Blue Jays ~
p.s. I'm not dissing the Harley-Davidson folks, but the $10,000 threshold would be exceeded at a H-D dealership even faster than it would at the BMW or Ducati stores. If you can't haggle prices too much, try to get a jacket, gloves, or a helmet thrown into the deal...