Out of curiosity I processed the same avi using K3 CCD Tools and then with Registax.
There's only the most subtle difference between the two finished pics.
nice one jjjnettie, I used to process in K3CCD all the time as it's quicker and less complicated than Registax. In the end I've gravitated to Registax 3 as it's more flexible and configurable via the wavelet settings etc.