TiaMaria,
I am sorry you haven't gotten any response yet but it does require a long complicated answer without a lot of information.
I am not familiar with JCBakker but they come up as a wholesaler for me. I find it odd that some of the plants you mention are grafted. They are easy enough to root. Are you sure they graft Viburnum, Rose of Sharon, Barberry, Hydrangea?
Also it is hard to design an unseen site. There are many variables besides just taste. If you break apart your question and search each one, you will find a lot of material to mull through. Such as "narrow evergreen", I came up with almost 750 hits just here on the GW. Sometimes the answer just comes down to what you like once conditions are considered. And there are always people pushing the ideal conditions and getting away with it.
May I suggest you take a day to visit Rare Find Nursery in Jackson? It is not the only place to go, but they have a very interesting selection of plants and its a great place to start. Plants do range in size. Some are too small and I might suggest you stay away from the smallest rhododendron starts unless you really must have something. It takes a while to go through between the offerings and the gardens so don't go when you are in a rush.

Here is a link that might be useful: Rare Find Nursery