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Interesting discussion. I understand all the theoretical reasons why a larger aperture gives better results but my personal experience hasn't really shown this in side by side tests. I have an 11" celestron and a 4" Tak refractor and even with careful attention to collimation and cooling in the SCT, it rarely provides more detail visually on Jupiter than the smaller refractor. Brighter, and larger image scale but much softer images 95% of the time. I'd also be wary of the EdgeHD Celestrons if visual planetary studies are your main interest. The vents are passive and not large so don't sound especially effective in assisting airflow, and the flattening optics in the baffle tube will stop you putting in a device like a Lymax cooler that greatly assists cooling.
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