Canister filters for Oscars?

Ooooo...canister is totally the way to go! It's made my life so much easier. Fluvals are considered good, although I've only had the Marineland C-160. (I wouldn't get that particular model for your tank, as the C-160 only does up to 30 gallons). The two filters you have are okay, it's just that HOBs are just so inefficient by their very design.