I always get a kick at some of the outrageous prices many of those skinners try to (and DO) get for articles that were sold in the millions - just by claiming "rare" or "unique".  A prime example are Cox engines...

Whatever plane you get, you'll want to - and will probably have to - true the shoe surface.  Very few planes arrive at the doorstep with a perfectly FLAT shoe.  This flatness also needs to be checked occasionally, especially on the lightweight models.

Use the heaviest grade blades you can get, a GOOD honing stone and oil, and learn how to hone those blades!  You'll be amazed just how dull those "new" blades are!  The difference in performance is eye-popping!

Here is a complete set up
http://www.ebay.com/itm/Wil-Kro-Combination-Razor-Planer-For-Straight-or-Curved-...

I am feeling the need for a good model builder's plane.  I had a Master Airscrew plane years ago, and it was OK, but I have been wondering if buying an old Wilkro on eBay might be better.  I think the Wilkro uses very thin double edge blades like those used in shavers.  Anyone have a favorite type?  Shaping trailing edges with sandpaper is getting to be a drag, and the trusty old #11 is too wobbly in my hands.

http://www.ebay.com/itm/Vintage-Wil-Kro-Safety-Razor-Planer-w-Box-Instructions-/...