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They're all good scopes Blake. The fork mounted versions are convenient for visual use but they're quite heavy, 65 pounds or so, which is ok only if you have no back or joint problems, or if you can wheel it out of a shed. The GEM is better for imaging, breaks down into smaller/lighter parts so it's easier to carry, but is not as convenient/simple to operate for visual use.
I'm visual only and have avoided weight/complexity by putting a C11 ota on an alt/az mount with digital setting circles (DM-6).
The Celestron HD should have the best image at the edge of the field, followed by the ACF then the CPC (due to different levels of coma correction and field curvature), but on-axis they should be the same.
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