Terrestial DSLRs have an IR blocking filter ahead of the sensor sence they are most often used in daylight. This diminishes sensitivity in the H-aplha wavelengths. Not much of a problem if you ask me. while purists spend the extra money on a "modded" camera (which merely removes this filter) most hobbyists don't bother about it and take spectacular pictures with the standard DSLR. In fact, it can get hard to tell which shots were taken by which camera unless th etarget is very heavy in H-Alpha. If you do get a modded 60DA then you will need to keep an IR filter on your lenses to take normal family photos etc.
FYI: You may have a bit of trouble reaching focus with any DSLR on a Newtonian. There may not be enogh backfocus distance to reach the camera sensor focal plane. This may mean you will either have to replace the focuser you have with a low-profile focuser, or you my have to move the location of your focuser and your secondary spider to adjust where the light cone comes to focus when it exits the focuser. "Astrograph" Newtonians have taken this into account at the factory.
As for software: Photoshop CC (Creative Cloud) can already do anything Lightroom can do processing-wise. For stacking Photoshop in any form can get tedious. Deep Sky Stacker does a very fine job of this chore and the price its right (Free).
If you want one single package that does all of you processing, the I would recommend Pixinsight or ImagesPlus.
But for capture and control of your Canon DSLR - nothing will beat BackYard EOS (although some try, but they don't quite come up to the mark IMHO).
Denham Springs, Louisiana USA
"Second star to the right - Then straight on until morning!" - Peter Pan
Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars