Sorry for dragging this post to the top again.
I had some unexpected stuff happen over the summer, so I never had a chance to update on what I went with...
I went with the Astrotrac, along with the polar scope and the Astrotrac mount. It's a very nice piece of kit and very easy to align!
Anyway, here are a couple of pics from my first real night out (well very early morning) out with it. Now that I'm back in korea, the not-awesome skies as well as work, etc. really do their best to get in the way!
The Orion shot is 10 75 second shots stacked in DSS with some darks and biases, from a school field right next to my apartment. I was surprised at how dark it was, and am looking forward to going out to a much, much darker site to which I've gone a few times before.
Canon 40D, Canon 70-200mm f/4 at f/4, ISO 800.