The Spec C will hold its value, but is 03, wants for a set of tires and almost ready for track. (maybe some better brakes) the weight saving for track stuff would get me all excited! the rear spoiler looks awful.
The Spec D has had the most amount of money thrown at it, love the brakes.. not to sure on the engine build its 2.5....It still needs an oil cooler for track work? from GRD??..dono on this., makes me sus when someone mentions problems as Nick has, at least get this checked by someone who knows there stuff before purchasing. this would also depreciate the fastest,.. probably worth the most in bits!
The JDM has done the most miles, its widetrack.. (bonus for an extra few mm here and there. - this will drive different to an earlier model though not sure on the size/geo of the spec C from standard? someone with better knowledge might be able to shed some light?)
This car would hold its value quite well, though not as well as the Spec C.. would definitely want new brakes for track work.
All will want baffled sump
Personally If the Spec C was really really tidy when you looked at it and everything checked out + you can line up a new rear spoiler for it.. then I would probably go with that as its just that little bit more special.
... ask the guy with the D if you can take the brakes for your spec C