I have put up a set of images I have taken so far with the Sky-Watcher 12" Auto Goto Dobsonian (1500mm at f/5)here:
http://www.flickr.com/photos/vontom/...7625885306790/
I don't have a webcam or dedicated astro camera so I can't comment about those. I am trying to get the most out of the equipment I have at the moment.
One thing I can say about a DSLR and a goto Dobsonian is that it is easy to set up and easy to focus. The tracking on the Sky-Watcher is accurate but not hugely precise. It corrects itself with small jerks which can make long exposures streak.
Cheers,
Tom