Since you filed jointly last year, and you have an idea of what your tax will be filing jointly this year, you could file a joint extension.
If you end up filing separately (usually not advisable), you could send a copy of the joint extension form to the IRS if your spouse is hit with a late filing penalty.
You can make a payment when filing your extension through TurboTax. If you do file separately, you can split the payment you made on both returns.
If you're using TurboTax Desktop, you can do a 'what if' scenario to compare MFJ with MFS. In FORMS mode, choose 'Open Form' and type in 'What-if', once you have entered both incomes and deductions.
Here's more info on Comparing MFJ vs. MFS.
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