Need opinions on this sump set up Please

[marciemp]

Right now we have a canister filter that is not working very well and is very hard to clean out. I want to add a sump but do not have much time to research and work out a system. Found this one on Ebay and it seems to have everything we need.

300 Gallon Aquarium Sump Refugium NEW - (eBay item 110200008700 end time Dec-05-07 08:06:09 PST)

Our tank is a 92 gallon corner tank that has been running for 1 year. Does this seem like a decent set up? It is made for a 300 gallon tank, would this be too big for our tank? There is also one for a 150 gallon but I figured the bigger the better? Is there anything in the set up that you would recommend upgrading? Would this be a definite improvement from the canister filter and aquaC remora hang on protein skimmer? We would be doing a refugium in the sump, and replacing the bio balls with rock.
Thank you,
Marcie