Dave-
We just re-rigged ours. The lower shrouds and lower backstay bridle are made with 1/4" 1x19 wire. The upper backstay, upper shrouds and forestay are made with 5/16" 1x19 wire. We used Catalina Direct. They supplied the wires with swaged fittings on the upper ends. We cut to length and used Hi-Mod compression fittings for the turnbuckle ends. I submitted an article to Main Sheet on what the project was like. There were 2 main reasons why we resorted to DIY; I had trouble locating a rigger and we figured we'd save a few dollars by doing it ourselves. With the mast down, it wasn't too difficult.

Dave-
For reference, our standing rigging cost from Catalina Direct was about $3300 plus freight. 
One minor suggestion we have is for your rigger to look at the aluminum castings at the end of the spreaders (where the upper shrouds pass through), and add some fasteners to retain the casting to the spreader. The only thing attaching our casting to the spreader was chaffing tape and the force from the upper shroud. If we had ever relieved the upper shroud separated the upper shroud turnbuckle from the chainplate, the spreader casting could have dropped out. Of course the need to remove the upper shroud turnbuckles would be very small, but we feel better about the spreader casting now being firmly secured. Additionally, I would recommend the rigger tape the shroud where it passes through the casting to insulate it. We noticed the casting was showing some corrosion in this area.