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I will only add that under most conditions the sky is the limiting factor. So, regardless of theoretical resolution, a lower resolution is mandated by the sky. Also, keep in mind that the larger the aperture the more seeing effects the image. Put a 6" refractor next to a 12" and in poor/medium seeing the refractor will often give a more satisfying image of a planet. On the other hand, even in poor seeing, a view of a deep sky object that is faint will usually look brighter and more satisfying in the larger scope. So, in my view there is always a trade off going on and it depends on what you want to observe. There is no "perfect" scope for all objects. Like many of us - down the road - you may find yourself with more than one scope!
Peter
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