If it's any reference I sold a 2007 350z GT HR last July for £10,100
It had 45k on the clock, 1 previous owner, Ebisu Black, standard aside a Cobra cat back (resonated) and some Bronze Rays.
Included in the sale was the original unpainted but kerbed Rays and winter tyres. Stamped and serviced every year from new, recent banana arms, a full major service the year prior (diff fluid, gearbox fluid, brake fluid, clutch fluid, engine oil/filter, new spark plugs, air filters etc), very recent Goodyear Eagle f1 asy 2 all round.
Aside some stone chips on the bonnet and bumper I'd say it was a minter. No idea if the new owner is a member on here or not.
But I wouldn't pay £8k for a modded DE like that, no disprespect. Then again I am a year out, but when you look at the classifieds on here and there is a 370z for sale for under £12k, it certainly gets me thinking if I should come back to Zed land...