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Doing galaxies are far more demanding than doing wide field work, wanting a larger telescope with longer focal length. On the cheaper side you can get a small triplet refractor along the lines of the Esprit 80mm with a QHY8 or QHY9C for OSC imaging. They are more expensive than cooling your own DSLR down but it requires less DIY and they already work with most software packages.
If you are content with wide fields and some of the larger galaxies then you don't need anything bigger than a 3-5" well corrected refractor.
Or get a 6-8" newt which is considerably cheaper but have their own issues.
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