I have no recommendations for you as of now but I wanted to say welcome to the board and I'm very impressed that you are starting the research. I WILL suggest you check out some threads on the board in the schutzhund section and see which dogs catch your attention there and then PM the owners to find out where the dog came from and gain info on them. Could be beneficial.
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Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus CAX, CGC, ETD, HCT, RATI, RATN, TC 3/18/2013
Zena GSD 6/1/03-2/16/2016
Riley GSD/BC 1/10/05-2/1/2013