All opinions here sound good so I decided to use only one db engine (PostgreSQL 8.1) and two databases; now I must tune my database generator parameters (I use PowerDesigner by Sybase) in order to work-arround the pg's identifier case sensitivity (newsgroups app (php scripts) doesn't use quotes (developed against MySQL) but the PowerBuilder app for company data uses quotes and mixed case of identifiers (developed against Sybase SQL Anywhere)). Thank you all for sharing all your experience and your time. Ivo
