Hello John!
I just wanted to drop a couple of lines about your question, since I own a DSI myself...
It is indeed a good way to introduce yourself into the DSO Imaging world, and at that price you won't find anything else that will do such job. You could of course wait a bit, put some more money together, and spend close to a $1000 for the next step up.
One word of caution... do not believe all they say about how easy & quickly you'll get shots like in the ads. I have not had much of a chance to use it, due to weather conditions, but I'll tell you that it has quite a steep learning curve (not as easy as 1,2,3) and that you'll spend countless hours either imaging and/or processing. (I've used it probably 2-3 days in the whole month I've had it)
Also, you'll need a good PC, with lots of memory, and USB 2.0 if possible.
Marketing has been very misleading, and I just wanted to make sure you knew how it is in reality ...
All in all, I like it. And I enjoy spending time outside and play with the toys... but I don't expect to get Magazine Cover shots any time soon...
Clear skies, and Happy New Year!

Ivan