I do not know the answer to your question. I'm pretty sure you'd be paying income tax on the money when you roll it over from a traditional to a roth. I just went through this with my tax person. Here are a few things to investigate.
1. Individual 401K or I401k - You can contribute 100% of the first 17k you make plus 25% after that, up to $50k , if your spouse is also employed by your company, she can do the same, so that's potentially another $50k depending on how much you make. That's a sizable amount of cash pre-tax.
2. Roth IRA another $5k for you and $5k for your spouse. I understand this is POST tax money, but if you look into this, you'll see its good to have both. You can roll this over to your kids, no forced distributions, use it to adjust your income level and you never pay tax on it again. If you are over the income limits:
http://en.wikipedia.org/wiki/Roth_IRA [see Traditional IRA conversion as a workaround to Roth IRA income limits]