Personally I think the IJ-70 would be a better buy. The adj. sites are not very sturdy but a much nicer pistol to shoot. The PA-63 would be easier to conceal for carry but a brute to shoot much. You might want to check out one of the Bulgarian Makarovs. A real good deal right now and you can't beat them dollar for dollar.
SKIP the PA-60-63!!!
These are simple Walther clones, often of fairly poor quality. The only thing they've really got in common with a Mak is that they fire the same round.
A Makarov is a robust, accurate, reliable pistol, one of the finest designs in the world. You just plain can't go wrong with one, no matter which one you get!