Hi,
The Celestron publicity on this one says it has a "built-in adjustable wedge" (although it is also an Alt-Az mount) and can indeed do astro photography:
http://www.celestron.com/c3/product.php?ProdID=413
Inspection of the user manual shows that it will track an object being set up either in "Alt-Az mode", or in "Equatorial mode", which sounds pretty fancy.
Wiser heads than me will hopefully let you know here how good it actually is at taking a photo though. There are all sorts of mysteries to be considered I believe
like flats and frames. To me it sounds like a block of apartments.
Note that the example you cited on eBay is being sold out of the USA, so would not have a viable warranty here, but since the price new in Oz is about $1000, that might be worth the risk.
Cheers