Tough question.
Most of the cars I lust after (E34 M5, urQuattro, 250 GTO, 250 SWB etc) are still available in awesome condition, albeit for a price.
For a project car ...... maybe a MkI or II Escort to full rally spec with something modern under the hood & AWD. Or an E-Type Jag convertible in B.R.G. to full original specs. Now that I think of it, an Eagle E-Type would be even better. It's an E-Type with all the important bits brought up to modern specs.
www.eagleetypes.co.ukDreams .......