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The closest thing to a 8" Dob is a 6" inch Dob. They are appreciably lighter and the longer focal ratio of the mirror may give a better corrected view, especially if only using budget eyepieces. I have owned both and rarely found that there was anything much more visible with the larger scope.
Other wise, an ED 80mm refractor on a altz mount may be suitable if your favourite targets are the Moon, planets, double stars and the otherwise brighter showpiece objects. One of their strong features is that they are ready to go; they really do not require any significant cool down time before commencing an observing session, which makes them ideal if one wants to commence immediately.
However if fainter objects are you preference, then nothing beats having a larger mirror (or lens).
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