PM Chris (captexas) and ask him how his is doing. He's running one of the new recirculating Euroreefs. I'm quite sure that it is going to be over the $500 though.

Don't know if you've seen when I've posted this site before but I really like it because it gives the ASM rating and then what they would rate it for. The G5 that ASM rates for 700 gallons they rate at 400 and that one is going for 489.99 with pumps. Not sure, but you could check with Pete about making something like these and you just buy the pumps. Good luck on the search, and finding the skimmer that you want.

www.asmskimmer.com