I paid £11k for mine, its a 2013 Black, and had 791 miles on it last July when I bought it, fsh from a Ducati dealer, even though it had only done less that 1k miles. Full termi with remap and filter, frame bungs, custom seat, duc cnc cylinder covers and other bits and bobs. Be warned though, the Termis are loud, very loud, especially unbaffled as mine are.
My mate bought his 11 plate Carbon off evilbay with 8K and paid £8300 , again full termi and new tyres in August last year.
Its a case of looking around and seeing whats available. If you have no p/ex then offer much MUCH less and start there. Theres a 12 plate on in Ducati Mcr with less miles for £10995 but with no p/ex go in at £9700 and chance your arm, they can only say no.
Or take a punt on ebay, my mate has no regrets with his. Have a look at this one for instance
http://www.ebay.co.uk/itm/Ducati-Dia...EAAOSwo4pYk2Du
I think that is the Mk2 version with the twin spark engine, supposed to be a bit smoother at low revs. Thats poss 3 years younger for the same money, and if your a cash buyer get in and chip them.
Good luck with whatever you buy. As a general rule, dealers will always be a bit more that private sales, but you get some security. Just ensure a FSH, and remember belts need doing at 5 years or 15k, so room to manouvre, also as the weather gets better prices may creep up. But I reckon you know all that allready !!
Stuart