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Hi Bill,
if you're getting an EQ6, adding guiding capability will only need a mini 8x50 finder and a guide camera or a modified philips toucam if you're skies are reasonably dark. (small guidescope-easier to get a guide star from darker skies)
you could start off without guiding but will soon see the advantage of guiding as you can increase your exposure time to get details.
From dark skies, you could get some good images with short unguided exposures, but its a bit more of a challenge from near city lights, still very much possible though. I took my first unguided eta pic from my backyard about 20k's from the city with a dslr and an 8" F4.
good collimation is required for an F4 though as well as a coma corrector with the correct spacing for your dslr.
not sure if the F5 will need a CC.
I'd suggest the F4 be it 8" or 10". wider field, more forgiving on tracking errors, quicker exposure and as james mentioned less prone to wind deflections and lighter on your mount.
which OTA's are you looking at?
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