Last year I compared my 6" Mak to my 8" C8 looking at deep sky objects in my light polluted skies. For clusters and nebula (with a nebula filter) the views in both were good. But for galaxies the 6" was hopeless, whereas I could spot the smudges of the brighter ones in my C8 (though the view wasn't anywhere near as good as at a dark site).
So if you do go for a 6" or less, remember that observing galaxies is something you probably won't be able to do from your backyard.
Regards,
Renato
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