I would get an Eheim 2028 canister filter. I would prefilter it with a Filter Max III prefilter sponge. I would pack the 2028 for bio-only operation a la RTR's well known method: I'd forgo any floss pads or mechanical media and pack the canister exclusively with Ehfimech. That way, you'll have a canister that requires opening and cleaning only ever several months. The prefilter can be rinsed weekly; it will provide mechanical filtration, while preventing most of the solid crud from entering the canister.
Depending on the fish (i.e., how messy they are), I might consider a second filter, one dedicated exclusively to mechanical filtration. You have many choices here, but the key should be choosing a filter that is easy to clean, so you'll keep the media very clean, thus avoiding the breakdown of solid wastes into liquid pollution. I like HOT Magnums, prefiltered with a sponge and packed with floss or sponge, for this purpose. Even a powerhead fitted with a sponge over the intake will admirably filter the water (although it's not so great for a display tank).
Does this help?
Jim