This would be more beneficial for you to file married filing joint return. You may apply for ITIN for your wife at the same time you file the return.
To do so, you need your wife to sign tax documents and send them by mail (e-file will not be available in this case).
You may apply to ITIN at the time you file tax return. Attach this form to your return and mail both together. You will not be able to file electronically.
Because you are filing your tax return as an attachment to your ITIN application, you should not mail your return to the address listed in the Form 1040, 1040A or 1040EZ instructions. Instead, send your return, Form W-7 and proof of identity documents to: XXXXX XXXXX Service Austin Service Center ITIN Operation P.O. Box 149342 Austin, TXNNN-NN-NNNN/p>
You may find additional information about ITIN here - http://www.irs.gov/individuals/article/0,,id=96287,00.html including what documents are acceptable as proof of identity and foreign status.
Do not mail any original documents! Notarized copy of my Wife's passport would be OK. Include copy of her passport with visa, copy of married certificate.
Please let me know if you need any help.