Have you considered inbuilt glass diy? ie, i'm running one atm that works similar to an overgrown plastic corner filter cross trickle, but running totally off air, has a great amount of flow and works better then any canister or hob
that I have ever experienced.
Easy for the home DIYer to make, and cheaper/more effective to run then anything.
This thing is just starting to take off over here.
I haven't built one myself yet, but I can supply pics and detailed description to those that are interested. a pm will suffice.
Final note: Very, VERY, effective biological and mechanical filtration.