In the eyes of certain CIEIOs in this company, PostGresQL would have the same disadvantages and reputation as MySQL. i.e. it's free and running on common Dell hardware. :-/ The only reason Oracle is not being considered is because it's far too expensive. That leaves DB2 as the only one in the running.
Besides, we need to investigate clustering and PostGreSQL's clustering is an add-on. Or experimental.
Wade.