Dave, go the 10" Dob for all the reasons outlined by the previous members. Aperture, aperture, aperture
You will not regret it.
GOTO is great for a beginner, and nothing wrong with it, but you will learn more by locating the obects yourself. What you are paying for in the GOTO feature, you are losing in aperture. With a Dob, what you are paying for in the aperture, you are losing in not haveing a GOTO feature or the ability to track with an equatorial mount. It's all trade-offs.
Get yourself a planisphere, a simple star atlas, and I would suggest a Telrad for your next purchase (approximately $79 at BinTel)
And get hooked up with a local astronomical club in your area - that's where the wealth of information and experience is.
Good luck,
Stephen.