Andy, I think a wooden veneered dashboard and stainless wire wheels could really help in the resale stakes, out of choice I would chose the alloys though. An auto box to future proof the knees too I think.
I think the painted dash in the 4/4 Sport I had worked well but it was 27k brand new and I think peoples expectations will be a little higher at 80k plus for the new model, possibly half will be new to the breed too so not as romantically involved as some maybe.