Have you considered the Seio's? My 60 has two 620s and one 820 as well as the Mag 5 from the sump. It's recommend 10 times your tank volume of water flow per hour but that would be for an empty tank. Every thing you put in there effects how water is going to flow and every peice will create dead spots. Most people will have 30 times the tank volume in water flow or more. The mod you speak of is a very interesting idea, it looks like there is a kit so you're parts are laid out for you and if you are going to stick with one powerhead I'd recommend the propeller mod but that's just my opinion.
Doug
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