Plenty of Black Givi V46's about which are identical to the DP box apart from being matt black instead of gloss.

http://cgi.ebay.co.uk/Givi-Top-Box-V46-TopBox-Pannier-Case-46-litre-Monokey_W0QQitemZ360065006604QQcmdZViewItem?hash=item360065006604&_trkparms=72%3A12%7C39%3A1%7C65%3A12&_trksid=p3286 ...

Out of all the Ducati motors, the air cooled ones are the most reliable. Look at Jantah's 'ton up' thread', he's done 60,000 miles on his. Give everything a good covering of ACF-50 and you'll be laughing.

The Multi it is then. They are more than capable in the twisties as I proved by keeping up with a 999 though some tight country lanes recently.

I'm 6'1 and can comfortably get both feet flat on the floor with both legs straight. (31" inseam) I find the riding position comfortable for about 3 hours ...

Tbh if you're keeping the GS, buying a Multi for it's sportiness doesn't sound like such a good idea. You already own a more than capable tourer so I asume that what you're looking for is a bit of fun. I suggest buying the Hypermotard