I bought my car (1995 R33 GTS-T M-Spec) in Sept '02 for $25,500 which had a solid $7k worth of light mods done to it (exhaust, suspension, audio, fmic, pod just the basics). I feel that i paid a slightly higher price for my car but I got exactly what I paid for (superb condition, light mods, awesome power for the light mods, etc). In the last 12mths i've put another $7k into it myself ($3k on brakes, bodykit, other basic stuff) and im still yet to touch anything major (hasn't even got mags yet haha).
I've done 28,000km and it has not missed a single beat (never stalled, etc). I fill it with nothing but Optimax, Motul oil and myself and it just purrs in any conditions its thrown at.
I think if i tried to sell my car now i'd be lucky to get about $22k for it so in my opinion it isn't even worth trying to sell im best off just keeping it for as long as possible until it starts giving me problems (hopefully well into the 200,000km).