Go for something like this:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=290599990619 
Just search for "ducati screen" on ebay and there's loads of options and styles.
You want a "double-bubble" or race/corse screen. There's a couple of different styles and different options on clear, smoked, dark, etc, so take your pick!
I'm 6 foot tall and found a screen like this made a big difference on my 748, as it pushed the wind over my head instead of it hitting me in the face & shoulders. I have a slightly different shape (will try and find a picture!) but very similar to this one.