+1 to everyone who recommended AquaClear.
I'm in the process of replacing the Aqueon Quietflow filters on my tanks with AquaClear filters. The filter design is the best out there, as it has a basket large enough for their great filter media, any bio-media add-on like ceramic rings, and anything else you may add, like some seeding material to speed up a fishless cycle. The motor on an AquaClear is arguably the quietest you'll find on the market. And people on these boards have hailed the AquaClear motor as the best for sandy substrate, as it doesn't clog like others will.