As I researched the issue on the web, I cam across Bill Pentz web page. http://billpentz.com/woodworking/cyclone/index.cfm This page also was very helpful

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Eventually I realized that needed a good system. I decided to go with 6 inch S&D pipe. I also wanted the area above my machines clear of obstruction. As a result I decided to bury the pipes in the floor.

 Burying the pipes has the benefit of grounding the pipes and gets them out of the way. The disadvantage is the pipes cannot be moved around. I decided to go with a center island in my shop so that I could arrange the bigger equipment around it. I put six ports in this area. The walls would house the other items.

For a cyclone, I decided on the Grizzle GO441. http://grizzly.com/products/3-HP-Cyclone-Dust-Collector/G0441 My main reason was the high maximum static pressure. I knew I would be reducing the 8 inch intake to 6 inches. We will see how this all works out.