By all means, get Registax, but, it's primarily for planetary/Lunar work.
As you have a DSLR, I would fathom that high resolution planetary work may be out of the question. Just too much fussing about to get any real detail. There's dedicated planetary imaging devices for that purpose.
I would say stick with DeepSkyStacker and/or IRIS as they're freebies and will get you to anywhere you need to be.
Cheers!
H
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