I have a really good farrier too. I have 7 horses right now and only one I have decided to start shoeing on the fronts, she is my 19 year old QH who has really flat feet and gets sore easy on hard services. The rest go barefoot.
I found a really good sight called barefoot for soundness, you might really enjoy reading it. It shows picturesa and gives a pretty good idea how a horse should be trimmed to be barefoot, I can now do my own if I need to. Here is the link
http://www.barefoothorse.com/

Cathy C