I have six of the Penguin 350B Biowheel Filters (and two of the Penguin 200B's). I really like them.
If you feel like it, though, check out the pricing on these same filters at Foster & Smith as well as Big Al's. It would save you some money to get them there!
Aquarium Power Filters: Marineland Penguin BIO-Wheel Power Filters
Marineland Penguin 350B Power Filter at Big Al's Online
Additionally, I use these "SuperCartridges" in them, vs. disposable cartridges. They have TONS of space for the beneficial bacteria and carbon inserts you can use if you choose (inexpensively). These are cartridges that never need to be replaced and cost $4. I highly recommend them... with all the surface on those and the biowheels, you've got lots of space for the good bacteria to live.
Aquarium Filter Media: SuperCartridge SC5
Good luck and happy shopping