Regarding the IRA, I would do a traditional IRA and most likely leave it that way. Here's why (This is my understanding and it could be inccorect. PLEASE CORRECT ME IF I AM WRONG):
For income, there is a standard deduction and exemption from tax. So for 2014, the standard deduction, for married filling jointly, is $12600. Personal exemptions are $3950. A married couple (no kids, not itemizing), does not pay taxes on the first $20,500 of income. Then you pay 10% on the next $18,150. Thus, if in 2014, a married couple (no kids, not itemizing), withdraws $38,650, they would pay $1,815 in federal income tax.
Since I don't know your tax rate now, its tough to give you a good answer. Either way, since your income now is low right now, and will be low in 5 years, I don't think there is much to optimize. One thing to consider, you can not withdraw your contributions from an IRA that is less than 5 years old. You need to figure out if converting from traditional to Roth will reset the 5 year clock.