Mmmm... Secondhand iOptron Cube should do the trick... Alternatively the iOptron smartstar is a basic altaz with go-to, and Andrewscom.com.au have them priced within your budget.
Better to get something with a matching tripod - not all heads fit all tripods, as I found out with my vixen SXD some years ago - and be prepared to sell or ditch the one you have. The vixen tripod was flimsy compared to one I already had, but without several new parts there was no way I could put the SXD on the one I had, and the quotes from a machine shop to make it for me exceeded the cost of the whole scope, never mind the tripod.
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