I would go with the fluval 405. I have the fluval 404 on my 55, the 405 is an updated model of the 404, they are virtually the same. The more filtration the better IMO, and IME.
Before you buy in a fish store, check out some of the online retailers, you can find these much cheaper online as most pet stores have at least a 100 percent mark up. I lucked out with the 404's and got mine for 70 dollars each off of ebay, brand new.