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Originally Posted by Rastis
The catch is I can only afford the 8" dob. For a extra $75 they will throw in a Crawford Focuser which seems to be popular around here.
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Well, that makes the decision much easier!
And only $75 extra for a Crayford sounds like a good deal. My refractor has a Crayford, and it oh so much nicer than the standard rack-and-pinion on my Dob. But the R&P does the job pretty well too (stiffer, so scope moves while focusing; annoying at high magnification).
To answer your original questions:
On a dark site, you will be able to see some detail in a few of the brighter galaxies, like the core and maybe a dust lane, but not really the shape as you might imagine it. E.g. no spiral arms.
Size of Jupiter: about twice the size of the full Moon, I'd say. Four full moons when conditions are good. Now, that may sound huge but consider how much surface detail you can see on the Moon with the naked eye.