Just provide Bitstamp with IBAN and SWIFT/BIC (which predates SEPA) for your bank account and you'll be fine.

- Bitstamp will instruct their bank Unicredit to transfer you xx.yy USD
- Unicredit will perform a USD>EUR conversion at almost zero costs
- Unicredit will send EUR to your bank
- Your bank will convert EUR to your local currency keeping a chunk of it for proving the conversion service

The end.