Jerry, I want to mention that Robo Hippy and Andy Chen have some great dust collection setups. Robo Hippy has this huge barrel collects everything, and Andy has a really inventive setup for moving a dust hood anywhere he needs it. It's very cool. I'd say both are far superior to my setup, which I made before joining this forum. I'm going to use Andy's design down the road a bit for my lighting and also for one lathe, and Robo Hippy's for my big lathe once I figure out how to adapt it.
I don't have a huge DC system and need to upgrade but am currently using a Grizzly cyclone at 800 CFM (they say), with a .5 micron pleated filter.
Mine is made of spare shop lumber, jig parts and a tupperware container. It works well and I'm pretty happy with the performance and the cost. I can put it right into the face of a bowl to sand, but it does get in the way a bit. I know you didn't ask, but here are some photos. Worth every penny you paid.
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