The one that came originally with the 92 gal oceanic corner tank. It has a built in needle wheel skimmer. It is supposed to be rated for 200 gallons, but then I found another web site that listed it as rated for 100. It is 20" long, 13 1/4" wide and 18 1/4" tall. The water flow is U shaped, in that the sump is separated into 3 compartments. It is a CPR IY194 : http://www.cpraquatic.com/products/cyclone.html (Minus the 2 Rio pump that comes stock). We still have the venturi Rio in a box somewhere in the attic, but the return pump Rio (just a stock Rio) has long since been thrown out. I would highly recommend just using MaxiJets in their place. There is the stock 3/4" or 1" bulkhead (not really sure the exact size since I never used it, but it looks like 3/4") installed that has a threaded plug in it. More info can be found here : http://www.aquadirectinfo.com/filter/CY192.htm . Looks like it would only support 400 GPH flow through, so not sure if it would suite your needs. And the build in skimmer can be taken out (and/or replaced by a "commercial" one), the "biobale" area can be used for chaeto and/or live rock and the return area has ample room for a decent return pump. It looks to be able to hold approx 20 gallons overall.
Looks like they still sell it for $280 : http://www.aquadirect.com/store/product.php?productid=354&cat=0&page=1
Although I suspect that is $280 Canadian (I can't imagine it going for that much USD). I was thinking around $50 obo for the sump, as is.
And finally, the one we used for almost a year up to the point where we built our own was a custom sump made by a company down in LA (We bought it through an LFS so I don't know exactly which company made it). It measures 48"L X 16"W X 18"T. Here is a picture of it in use back when we had it set up. There are no bulkheads or other hole cut into this sump at this time. It looks to be able to hold approx 60 gallons overall.
We paid over $500 for this one (but again, it was through an LFS) and it served us well with the 'fuge section. It is very well built, with the holders for the large filter socks. It is built with 5/16" acrylic. We were looking to get $175 for this. (that would basically cover material cost if one were to make their own, and bought the acrylic from Tap Plastic).

Looks like they still sell it for $280 : http://www.aquadirect.com/store/product.php?productid=354&cat=0&page=1
Although I suspect that is $280 Canadian (I can't imagine it going for that much USD). I was thinking around $50 obo for the sump, as is.
And finally, the one we used for almost a year up to the point where we built our own was a custom sump made by a company down in LA (We bought it through an LFS so I don't know exactly which company made it). It measures 48"L X 16"W X 18"T. Here is a picture of it in use back when we had it set up. There are no bulkheads or other hole cut into this sump at this time. It looks to be able to hold approx 60 gallons overall.

We paid over $500 for this one (but again, it was through an LFS) and it served us well with the 'fuge section. It is very well built, with the holders for the large filter socks. It is built with 5/16" acrylic. We were looking to get $175 for this. (that would basically cover material cost if one were to make their own, and bought the acrylic from Tap Plastic).