Magnum 350

Magnum 350's are good filters...I don't like them as canisters though. I've used it and find it to be a pain, thats just me though. If you're willing to spend money, I would go with an Eheim...it's slight overkill but I love mine. You can find enough info on that through this website; the only downside is the cost (you're looking at about $170 initial startup,) but you rarely ever have to change the media (couple times a year,) and I only open mine up to clean it about every 3-4 months, (although I probably should a bit more often.) My Magnum 250 gets opened about every 1-2 weeks, and the 350 wouldnt be any different.

If you're not set on a canister, you would do fine with a HOB - Hang on the Back - filter like a Whisper or Emperor for a 55G

go with the filstar, i have heard nothing but horrible things about the magnums, and nothing but good things about the renas

I want a canister to stop that trickling noise.

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Then a Magnum 350 will quickly become a closet counterweight. Every one I've seen clacked and whirred and buzzed like a swarm of bumblebees playing patty-cake. Eheim is the quietest thing I've ever seen. I've never used a Filstar, but have heard they are good too.