I vote for the eheim all the way. I have two eheim classics 2215 going on my 125 with an aquaclear 110 and I couldn't be happier.I also have the same filter going on my 46 gallon discus tank and it is wonderful.The eheims have been going strong for almost four years now with no problems to date with them. I have never owned a fluval so I can't comment on them but I have heard that they are not as good. You pay a little more for the eheim but I think it is well worth it. If money is not an issue, I would go with the eheim.
Marinemom