Let me just say that is brilliant for such a short time using a DSLR.
I got into photography because I ended up with manual film cameras trying (badly, and in the wrong way) to do astrophotography. I went to the zoo one day and was hooked.
I haven't given up on astrophotography (even took some photos of the Venus transit) but I'm not trying to do long exposure stuff. Life is just too busy right now with a young family. And to be honest I'm spoilt as there is so much good professional and amateur astro work that if I'm honest the only thing I'll gain is a sense of personal accomplishment. Planetary isn't a bad starting point.
Also do not forget the moon. Here's one I got with a point and shoot held up against the eyepiece of my dob, then overlayed with Virtual Moon Atlas
http://www.progsoc.uts.edu.au/~sammy...yAnimation.gif
It's amazing what you can do without highly specialised gear IF you're willing to give up deep sky.