Remoras are a good bet on a low maintanance filter. Like any other injection skimmer, though, the performance is largely dependant on salinity and whether or not the tank is contaminated with oils (KEEP YOUR HANDS OUT OF THE TANK WHEN USING THESE!).
Other than that, you could go for the Coralife Superskimmers. They're very well priced and can remove quite a bit of junk from the water column. That said, there's a few glaring drawbacks of which I've addressed in a post in the Product Review forums.
I hear EuroReef is working on an HOB skimmer though...
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This and that.
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