Alan, the info I have is excellent, for the life of me though I can't trace the source. It is an exjw that wrote it. It is very positive regarding Ptolemy and Berossus as being incredibly accurate resources for the regnal lengths of these kings.
What I am looking for to go with it, is either a great book OR online source that is nonjw/exjw that goes into some detail about chronology. Something to use as a good reference.