The original is superb, even more so considering it's taken from suburbia.
Interesting as it is, I'm not sure the Ha is really adding much to the story of M83 though - the red nebulosity present in the original is quite pronounced already, and the overall colour suffers with the Ha RGB blend.
NGC 300 for example, on the other hand seems to benefit from adding in the Ha, so maybe it's just a galaxy by galaxy thing?
A wonderful image regardless.
