Reaver, thanks for the response. I've been looking at the UniStrut ones for a while as well and thanks for the link to that thread, been reading through it to see what I can learn from it as well. Just the design of Channel Strut appeals to me in that it just looks stronger.
Having said that, the same problem of sourcing at an inexpensive price seems to remain. I went to Home Depot, Lowes, and Rona, but nobody carries it. Fastenal carries it and has 10ft lengths in stock, but they want about $60 per length + tax (http://www.fastenal.com/web/products/details/48124?searchMode=productSearch&filterByVendingMachine=). Figuring I'd need 3 10ft lengths = about $180 + tax, and that's before fasteners.
So I'm back to square one, has anyone sourced any of this in Canada for a reasonable price?
Not sure about Canada, but in the U.S. Lowes and Home Depot carry Unistrut. It is in the electrical section with conduit.