Hi David,
if you could tell us what kind of astro photographs you are looking to take (eg planets or deep sky objects or lunar), there are several members here who may be able to give some advice or direct you to an appropriate forum.
I started with astrophotography about 3 years ago with a 10D and a £100 scope and s/h mount just to see if I could achieve anything. I'm still working at it and there are many highs and lows along the way but I would say it's a fantastic feeling when you get the first picture of the dark sky!
I've seen some fantastic photographs posted here.