I know everyone here recommends eheim but I have one of them and four cascade's I've had to replace the impeller on the eheim twice and the cascades kept running.
The eheim seems to be a good quality filter but since I've had the problem I had I don't think I would buy another one.
But again this is just my experience, yours may vary. (disclamer)
I use the eheim as my spare, I use dual cascades on both aquariums.