If you are looking at HOBs, I would recommend the Aquaclear, Emperor, or Penguin models. Are you looking for a replacement for the 30 gal
in your sig? If so, I'd go with the Aquaclear 70 (300), Emperor 280, or maybe the Penguin 200B (the 350B might be too much current). It really just comes down to preference- the Emperors and Penguins have the Biowheel, but the cartridges are expensive and they are louder than the ACs- still a good filter though. The Aquaclears have no Biowheel, but come with ceramic rings, a carbon insert, and a foam block. They are very cheap to maintain, as you don't really need to replace the foam unless it gets torn up, and as far as I can tell you never have to replace the ceramic rings. You can just rinse the foam block in old tankwater (NEVER in tapwater) every once in a while during your PWCs. I don't use the carbon in mine, I just stack 2 foam blocks in there and put the ceramic rings on top and this works well for me.
You probably already know, but don't forget to run both your old and new filter together on the tank for a couple weeks. This will seed the new filter and prevent a cycle when you remove the old filter. HTH