My bad,
Choose the best and biggest skimmer you can fit in your sump and the highest qualitly you can afford. From what I have heard the big Becketts out perform everything else but, the downside is the powerhungry pump that is needed to drive them. Large Airstone driven skimmers can perform very, very well but the downside to them is that they need to be about 6' tall to work to their potential. IMHO there is no reason to buy a venturi driven skimmer as the needlewheel pumps are proven to be far superior. I would try and find a few people in the club that have a similar setup and see if you can check out their systems and see how the differant skimmers perform and how much space they take up and talk to the owners about the maintenence, product support, and overall happiness of their skimmers. Your welcome to check out my 2 systems and 2 skimmers and see what you think.
Dan