Hi Andy,
Well you could start right away with NO further equipment in the meantime on some bright objects. 300mm f2.8 for 2 sec at iso800-1600, maybe lower,and then combine/stack the images. The D600 has wide dynamic range and should allow you to pull things out of the darkness in post processing.
Other than that look for 2nd hand EQ5 or NEQ6 for ~$700 to $1000 or so. Of course these are MUCH beefier mounts, compared with the iOptron Skytracker you mentioned, but should serve you well for a long time, and when you're done easily sold on.
Best
JA
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