This is a follow-up to my Dream Network post.

A lot of people suggested that I not use Microsoft servers. Regardless of pros and cons of various server OSes, I'm dead-set on going with W2k3 w/ AD for the PDC. In terms of a database server, however, I'm relatively open to going with something other than SQL Server. Ammo pointed out PostgreSQL as a good alternative. I've had experience with mySQL on Red Hat Linux, but I've had some reliability issues with it, which drops it out of the running. I've done some research on PostgreSQL, Oracle and SQL Server, including finding some good case studies, but I want to know real-world experiences from people that have had both good and bad experiences with various DBMSes. What kind of experience do you all have with using PostgreSQL (or any other databases) in a large business environment and what advice can you give in evaluating different products?

AJ