You might want to check out "The Wizard of AAHS" on ebay. I got a Marco Valentino suit from for $280 shipped (dual vents, nice lightweight tropical wool, flat front pants, subtle pick stitching, half canvassed, athletic/slim fit).
I would easily categorize this suit as being in the same class as the Zegna's and Hickey Freeman suits I saw at the Barneys Outlet.
Another option worth considering are the "Benjamin" suits offered at www.ehaberdasher.com
. They run around $500 and the suits actually have a full canvas construction from what I hear.