I just was GIVEN (well given back) a 5 year old Fluval 304 from a guy who I sold my tank to who no longer needed it.
It works perfect except for a impeller cover (which I got for $8 shipped on amazon). Fluval's (used) are cheap cheap cheap and worth the money. A 305 or a 306 are newer models (and they scale up) but the quality and design is very similar.
They offer a lot of flexibility both in what you can do with your tank (planted, SW
) and in where you in-flow and out-flow is too.
That having been said, I am still cleaning it and waiting for a part while I am running AquaClear HOB
's. Still, for such an old filter it still works great, has TON of filtration and pumps A LOT of water. I love them and suggest looking on ebay or your local LFS
's used swap to find one. They are out there and if you properly clean and replace gaskets/parts etc. they are worth it by far IMO