Hi Paul,
I use a Philips Toucam Pro II which does an excellent job on Planets and the moon and has been modified for long exposure (i havent done any of those yet) cost me $100 second hand from IIS here.
Recommend it. Here are some examples of my better shots.
Jupiter
http://www.iceinspace.com.au/forum/a...se.php?a=62348 and
http://www.iceinspace.com.au/forum/a...se.php?a=62346
Saturn
http://www.iceinspace.com.au/forum/a...se.php?a=54238
Cheers
Chris