Obviously depends on what you're hoping to photograph, but you have an excellent mount that will carry anything up to a 14".
The degree of difficulty increases with focal length, so perhaps you might want to consider starting with an ED80 or similar - see in the deep sky section for what can be achieved with one of these and a decent DSLR (which you also have). You will need to research drift aligning - I have the polar alignment scope on my G11 and it gets me well enough aligned for 5 minute subs through a 500mm lens within a few minutes. Others do not like them.
You might then consider getting a short tube 80 and webcam, or finder-guider package so you can run an autoguider, which frees you up for the more important aspects of stargazing (drinking, staying warm, visual observing...).
cheers,
Andrew.
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