If you get an ITIN, then your wife will have a deduction of $24,000 (MFJ), otherwise $12,000 MFS. Select the options to see the refund difference and if its worth it in your situation
If your wife does apply for an ITIN for you, you'll need to print your return and send to the IRS with W7 & supporting documents. Some H&R block offices are CAA's though, so for a fee they would authenticate passport, so you wouldn't need to send it via the mail.