This is what I just bought for astrophotography.
http://www.telescope.com …tor-Telescope/p/24281.uts
There are three types of mounts. Dobsonian, Alt/Az and Equatorial. If you want to take pictures and have your camera negate the rotation of the planet so that it stays on target, you want an equatorial mount.
I own a Dobsonian-mounted Newtonian, which I have used for taking amazing shots of the moon. Cost was around $300. But you have to move the scope yourself and it won't follow anything automatically.
I also own that scope and mount I linked above. It follows whatever object you want to track in the sky once you've aligned it properly. The mount also has a good payload-to-weight ratio for the optical tube, my Canon 550D and the guide scope (sold separately).
A few things to keep in mind:
1. Astrophotography is an expensive hobby. There's always another item you need that will make your photos that much better. You have light pollution? You may need a filter for that. Your pictures have stretched stars on the edges? You may want a field flattener. Is the focal length of the scope a bit too long? You may want a focal reducer. You want to take pictures of planets? You may want a CCD camera. Can't get focus with the CCD camera? Might need an extension tube. Image not big enough? Might want a Barlow. Or two. The list goes on and on.
2. If doing astrophotography, the weight of all your gear, when mounted on your mount, should not exceed 50% of the payload capacity. That includes your camera, the guide camera/guide scope, the extension tube, the t-ring and t-mount, the optical tube, etc.
Might want to read up over at StarGazersLounge.com or CloudyNights.com and get some expert opinion. A sturdy mount should be where the bulk of your cash goes. Not trying to dissuade you - I think this is a great hobby but it has also cost a fortune and I have a list of things a mile long I want to buy that will make my photos better.