I went with the Astrodon IR/UV filter mod done on my 60d by Hap Griffin and have been very happy with the results. I still use the camera for daylight photography, so all I had to do was to set up a custom white balance. You know a nice modification that is completely free is to download and install Magic Lantern as your firmware. There are many things you can do with the software that you will not find in the Canon system menu, like intervalometer programming, programmable mirror lock, exposure time override, and much more. There are plenty of times when I just want to do AP without a laptop controlling the camera, and Magic Lantern really gave me a lot of tools to accomplish that. I also use an RF remote that gives me hands-free control of the shutter.
If you plan to continue using a DSLR for AP, you could look into having a cold-finger peltier cooler installed or perhaps have debayering done on the sensor. You could also build a cooler box to help lower the noise profile of your camera.
Edited by sparkyht, 22 August 2014 - 11:15 PM.