Well, I have three Fluval 404's. On my 55tropical, I have two 404's, and on a 55 goldfish tank i have one. I planned on heavier stock in the tropical tank, and less current in the fancy goldfish tank. Water quality is great in both, so I am not sure you need two 404's for a 55. But I like to overfilter when the current is not an issue.
I have heard great things about the Eheim. I am not happy with the Eheim price. I am satisfied with the Fluvals. More than satisfied, actually. I have had a Magnum a few years ago, and think the fluval is better. The other brands I have no experience with.
I think you will be pleased with the Fluval.
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Oceanic 55+,two Fluval 404's,In-line 300W heater,Moderately planted with Polyvinylus Chloridus sp.=the only plants that last in my tank