As mentioned earlier if you want to get into Astro imaging then the most important part of the setup is the mount. It's usually a high investment if you want to get a decent computerised one but you can spend much less and get a manual one (requires more work to capture images however).
I learnt the hard way and started Astro imaging with an SLT mount. It was wobbly and not really designed for imaging (but you can make some adjustments like I did to make it much more sturdy). At the time I could not afford spending more than 1k on a mount. I recommend you buy a used mount if you can find one here on the forums (I bought mine on here and saved around $400 the RRP).
If you are serious and want to make this a long term hobby I think buying a proper computerised mount will benefit you and is something that will last for years and years.
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