MS SQL Server <-> PostgreSQL data migration _that_ _actually_ _works_?

Hello,

does anyone know of a not-to-expensive data migration tool (or of a
time-limited trial version of one) _that_ _actually_ _works_ for copying
data back and forth between MS SQL Server 2000 *duck* and PostgreSQL 8?

I have tried so far (none worked):

- MS EM DTS (SQL errors)
- EMS PostgreSQL Import (obscure error about "address family not
supported")
- DTM Migration Kit (SQL errors)
- BaseNow (SQL errors)
- DatabaseBridge (SQL errors)
- SwisSQL (SQL errors)

TIA,

Best regards

Wolfgang Keller