If I'd known that Kawasaki made a black and gold Z900RS with a racing-style quarter fairing straight from the factory, I'd very likely have bought one instead of my Aprilia. The couple hundred $ it costs over the Ducati will be made up for by maintenance costs within the first year of ownership unless you're willing to do the cam belts and Desmo valve adjustment on the Ducati yourself (hint: it's a pain in the ass). They're both going to be fun and look great, albeit with very different characters; it really comes down to whether the Ducati's inherently Italian cost of ownership is worth it to you.