Hi Jon,
Looking at your pump choices, I assume the pump has to be a submersible pump? If I had to choose one of the two pumps, I would choose a mag 7. I've used many different mag pumps and I've never had a problem with any of them. Another excellent pump to look at is the eheim series of pumps. The build quality of those pumps is excellent but you do pay for that in the end.
What type of standpipe are you using in your tank? A better standpipe design such as a durso, stockman, etc. may help with the noise problem.
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32"x32"x20" Cube-ish tank
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