In the UK, Carrera GTs are advertisesd at about £375-400k (£75k over list).
Enzo's are going for about £550k, or euro830k
The DB9 is new, at £140k, up £30k and the continental GT used to carry a £20k premium, now only £5k over list.
All Lambos are highly priced, a Gallardo £25-30k over list, and a 1 year old Murcielago goes for retail price with less than 3000miles.
The F50 seems to be at £300k, the F40 at £140-180k and the 288GTO at £180-200k
[EDIT]
BTW - check out these sites for some new exotics and their prices in the UK
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www.williamloughran.co.uk
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www.tomhartley.com