Just wanted to post my $0.02 about the Marineland C-220 filter.
I've owned one since November 2007, and have been running it on a 30 gallon long tank. It's a fully planted tank, so nitrification isn't as important for this tank as it is for yours.
I love the filter (easy to perform maintence, easy to detach from aquarium), but the one problem area I have is the flow rate. After 3 months, I can't get the flow rate back to where it was initally. I've tore down everything but the inlet/outlet assemblies to clean. If your flow rate drops as much as mine has in a 36 gallon tank, I think you'd have real problems, but I can't tell you if it's something I'm doing wrong, or the filter.
The filter can handle a large bio load, but I'd replace the bio-balls with Sechem Matrix or some other dense media (Fluval ceramic rings, or Matrix, or my current choice Ehiem Ehfisubstrat Pro). Maybe take out the ceramic rings Marienland provides and replace with something that houses more bacteria as well. The Marineland ceramic rings are really smooth, and I think are more for coarse mechanical filtration than biological filtration; the provided sponges do a good enough job at that.
Hopefuly this rambling give you a little information.