Thanks for all of the replies and suggestions.
I decided to go with the MCE600 unit. Purchased and installed it today. Pretty much plug and play. I'm very happy with the noise level (or lack of). The pump is quite quiet. I can hear the air intake over the pump
Much better (in terms or noise level) compared to the Prizm Pro.
Two things that I could nit-pick about.
1. The power cord is way too short! Forget about a drip loop. It needs to be double in length.
2. The collection cup should be transparent on both sides. I have the skimmer mounted to the side of my tank and it's difficult to see what's collecting in the cup and how high to adjust to create the proper skimmate consistency.