eddieC,
All of those beautiful engines that you saw in Phoenix are part of the collection of Paula and Paul Knapp. How lucky you are to have seen them on display! You can see many of the interesting engines in his collection and this history of his public displays here....
http://www.engine-museum.com/
http://www.craftsmanshipmuseum.com/KnappCol.htm
My understanding also, is that that Wasp Jr. that you captured up close is Paul's engine project. I'm not sure when they will be available for sale, but he is making several of them. What a beautiful thing!
He is also one of the most stand-up guys that I have had the pleasure to correspond with.
On another note... Attached you'll find a photo of much of my collection. It's a year old or more, so not so accurate anymore but nonetheless.....
Two Technopower 7As have been sold and The Wide Canyon is sold.
Added are the Seidel UMS ST-990, Brittish Magnum Vee twin, Valentine 3 cyl radial and 2 cyl Vee (Diesel), cox three cyl radial and a Technopower 3C. I'll have to make a new photo soon.