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First thing I'd be investing in is a field flattener. You'll get much better results with that and your current camera.
From there, the question really becomes what exactly are you trying to achieve? If you want longer exposures then maybe guiding would help, but where are you shooting from? If it's from a light polluted area then longer exposures won't really help you - I'd suggest going narrowband instead.
A dedicated astro camera with cooling really, really helps in reducing noise so that might be the way to go (either color or mono). But yeah, first thing before any other purchase I'd get a field flattener.
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