I'd suggest you look on autotrader.co.uk or similar, to get a sense of what money people are asking. For example, I see that "new", zero miles, 900S bikes are going for £4200. However, be aware that the 900S is a "budget" model with cheaper shocks and so on, I believe,. I rode a 750S a couple of times, and it was like sitting on an iron girder. Made my 748 seem like an armchair by comparison! That said, I have the so-called "cheap" shock on my 748, and it works perfectly well, and is still going strong after 40000 miles!
The 900SS is a lovely grunty bike to ride, very long-legged (over-geared as stock, in fact). The riding position is *slightly* less radical than the 748/996, but against that, the seat height is a little greater. You would probably want want to back off the damping settings for road use. Most Ducatis are pretty stiff as stock, as I'm sure you know. The side-panels on the injected bikes provide a limited, but useful, storage space for locks, waterproofs, etc.
If you go for a secondhand one, make sure the belts have been changed recently, and that the clutch is not on the way out (any slipping, or graunching when pulling away?). Those dry clutches don't last forever! But if the basket's OK, replacing just the plates is a very straightforward job; even a DIY muppet like me can manage it quite easily!
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