I'm a big supporter of PostGRES, and I think you should use it wherever possible. BUT: MSSQL is not that expensive. To compare apples to apples, you need to com

I'm a big supporter of PostGRES, and I think you should use it wherever possible. BUT: MSSQL is not that expensive. To compare apples to apples, you need to compare it to EnterpriseDB. EnterpriseDB is slightly cheaper than MSSQL, but not a lot cheaper. They're both so much cheaper than Oracle that the difference is negligible in comparison.