I would recommend a tunze 9005 or 9010. Although they hang inside the tank their performance is impressive.
http://www.jlaquatics.com/phpstore/s...t_ID=tz-ps9005
I have used prizms and seaclones/jebo and dont recommend them personaly. I do like the AquaC remora pro but it is not stellar. Free shipping also from JLaquatics.
just my 2 cents.