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Yeah I concur. For astrophotography you need a good mount and the scope can be made from parts if you like (commonly known as ATM). You could use a film SLR, that would be cheaper. In any case you will need a guide scope (or at the very least an off axis guider), which could be a cheap scope from camera shops, a cable release and a good guiding reticle. In any case 3-5k is about right. Bintel in Sydney and Melbourne both sell telescope parts for a Newtonian, and this might be the cheapest astrophoto option. I think Andrews also sell Newtonian telescope parts.
Anyway don't be daunted, do some research and look at prices and see how you go. If you want ask about which optical design is suited for which form of Astrophotography. The design will influence how much you will need to spend.
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