I've used Eheim Classics, Eheim Professionals, and Rena Filstars.
I would suggest a Rena Filstar XP1 or XP2. The relative high costs of the Eheim Classics are unjustified IMHO. If you are bent on Eheims, then the Professional series is what you should be aiming for.
As far as I am concerned, the only drawback to the Rena Filstars is the noise, which is loud only compared to the Eheims. My refrigerator makes more noise. And remember that the filter would be housed inside a cabinet, so the noise would be lessened. If you're Superman, then well, maybe you should go for the Eheims. :lol: