I made my own dust collector years ago, a big wooden box with casters withan inlet pipe that you attach the dust collecting hose and another inlet for
the shop vac hose, with wooden seperator panel inside plus household
furnace filters. Cheap design but works well. There is very little particle in
the shop vac, all dust/particles are collected inside the box. The cylone is
just a better idea/design, very simple and effective. Saves you real estate
if you have a small garage. $165 for that cylcone piece minus bucket, shop
vac, and you probably need to make the interface hardware to the bucket?
The old school idea is the ordinary dust collector.
$179
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=45378
Seems like it got rave reviews in spite of being a 'cheap' clone as the other
brands cost $100 more. Problem is, only 30 micron filtering.
These folks make the uber filter for the bigger dust collectors. I don't know if
they offer one for the $179 system and if they did, the filter price ain't cheap.
http://www.wynnenv.com/cartridge_filters.htm