You could also buy a D.A.S EX-2 ($416 shipped on Ebay) or D.A.S EX-3 ($619 shipped on Ebay). They are Clones of Deltec's Recirculating Skimmers. I have an EX-2 and it really pulls out some gross stuff in no time flat. I just thought I'd give you more options.

BTW: I think the Deltec APF6000 and the D.A.S EX-1 ($300 Shipped) are the Exact same Skimmer.

http://www.deltecusa.us/proteinskimmers/apf600.php

http://stores.petorama.net/Detail.bok?no=73