08-21-2011, 03:24 PM
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I switched from an AquaClear HOB filter to a canister filter quite a few months back, and I am happy with my choice. My reasons for switching were that a canister filter is quieter, and I didn't want such a strong current in my tank. It was adding too much oxygen to the water and my plants were not thriving as they should have been.
I would say the opposite of what Barbman said as far as filtration capabilities... I personally prefer to have a filter that's rated as close as possible to my tank size, and when faced with the choice of slightly underfiltering to greatly overfiltering, I went with a filter that's rated for one gallon less than what my tank is due to my concern about the current, and I know that I have enough plants to allow for that slight underfiltration. If your tank is not planted, then I would agree that more filtration is better than less, but then I still wouldn't go too far overboard because I don't think your fish would like to feel like they are being pressure washed day in and day out.
Also, Eheim is a good, reliable brand.