If your talking primary scope and you can handle it I would be tempted to go for the 8-12" dob..it seems that down the track you can stick an 8 or 10" on an eq5 or eq6 fairly easily.
I cant comment on the suitabllity of your existing mount for the Mak, but as for imaging and DSO's - I've got a feeling the Maks are meant to be better suited to lunar or planetary stuff rather than faint fuzzies etc
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