Bottom line is that if you want to keep a white interior, you don't have any good options. NONE. Good used ones are basically non existent.

Personally, I chose to ditch my white interior, switch to black and use used panels, freshened up with a very light dusting of SEMS Landau black. Look like new, with correct texture.

Buy the repro's...and you will end up with a Hodge-podge of panel grains and shades of white.

If I absolutely had to keep the interior white, I would buy the lightest color lower panels I could find (probably a light tan/gold set) that were not chaulky...and dye them to match, knowing that they will have to be "touched" up with some regularity. This route is both the cheapest and best looking, but will require maintenance.