]This is a good question and most people will tell you NOT to convert to a Roth. I graduated residency in 2010 and maxed out my 457 during residency. The pension plan during residency gave me another $20,000 or so when I left that I rolled over to a Roth. [/B] In total, this was a sizable conversion but less than $100 G's. Every article and message board I've come across, they highly discourage a conversion, especially for the high income earner. Interestingly, my Accountant and our group's financial advisor actually recommended the conversion.
I prefer the Roth because like you, I could afford to pay the tax now. There is no minimum age to start withdrawing from a Roth and a Roth can be passed to all heirs completely tax free. I ended up spreading the tax hit over 2 years (only in 2010). Yes, it's never fun owing thousands to Uncle Sam when most people get refunds, but to me, it was totally worth it.
Certainly you're in a different situation since your IRA is probably much larger and you'd have to cough up the entire tax bill in a few months. Not knowing anything about you, it's basically impossible to try to help answer that question for you.
Check out bogleheads.org. It is a great resource and people are very helpful. You can post your vital information on there (age, tax bracket, investments, debt, etc ...) and people will give you great, professional, and FREE advice without having a motive. I've been reading that message board for about 5 years and am quite comfortable managing my own finances.
Hope that helps some.