As Logan said, if you're going to be making $160k a year from now, and expect to be making around that much (inflation-adjusted) for your whole working career, your only IRA choice at that point would be a Roth IRA, and in particular, a Backdoor Roth IRA.
In order for a Backdoor Roth IRA to make sense, it's best to have no pre-existing tax-deductible assets in a Traditional IRA. Otherwise you are taxed on those existing assets each time you make a Backdoor Roth contribution.
From that perspective, I would say to just keep your IRA money as a Roth, for 2014 and 2015, and then you can continue to do Backdoor Roth contributions for all future years.
I don't know, maybe it's more optimal to have your money in a tax-deductible, Traditional IRA for a year or two, then convert it (and pay taxes on it) in the year before your income goes up, and do Backdoor Roth contributions for all future years. But even if it is, the numbers are aren't going to be very different, and especially compared to the amounts you'll be saving in the future, your 2014/2015 IRA contributions will be relatively inconsequential in the whole scheme of things.
But yeah, even in your high-income case, if you're planning on retiring early, with expenses much lower than your income, then Traditional would be preferred over Roth. The only reason you'll be doing Roth is because a Traditional IRA won't be possible, but for the same reason you should max out a Traditional 401(k).