How big is the tank in question? I like the idea of the eheim accompanied with a good HOB filter such as an aquaclear or a penguin. The eheims are a little more expensive then some of the other canisters bit it is a lot of bang for the buck and you only get what you pay for anyways. The eheims are extremely quiet(if quietness is an issue for you. It is for me.)and they run flawlessly. I have run two ehem classic's 2215's on my big tank for five years now without a problem to date. I also have one running on my planted discus tank and again no problems to date with it. I would try a canister filter of which ever one you like and use it with a hang on back. That way if one of the filters shoud fail, then you will still have the filteration of the other filter.
Marinemom
Marinemom