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ChYeah, always wondered why you didn't stick a barlow on that old rig - you may have gotten close to matching the performance of the TOA! 
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I always thought about it but never got around to it
...I think the TOA has a better Marcus lens than the AP and that's probably about it
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Full extent eh?! For YOUR benefit only  and remembering mine is 1) a mere 1/3 the exposure of your deep image and 2) taken from much less than a truely dark sky, I've attached a compressed version of my hyper-stretched image. You can see it shows quite a bit of the extent your remarkable image does, but not quite with the same quality. Surprising really, only 7.5 hours (3.5 hrs Lum) and not in the darkest part of my sky. Man, if I only had a reeeeally dark sky <sigh> ... watch out!!
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Yep certainly some outer stuff visible there, nice work, not often seen
...man I sigh with you..dark skies are like the seeing, when they are good it makes all the difference...thing is you never know when the seeing will be good, at least you can plan to use dark skies
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The 3 focal lengths my TOA serve me well and gives me a lot of options. I'll still be getting a larger aperture though, but my primary goal will be longer FL work rather than WF stuff.
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Yes a very versitile system...a nice big RC or ODK would look more appropriate on the PME for sure..and it's all about looks so you could just mount the TOA beside it and use the bigger scope as the guiderscope
Mike