Probably most folks here know about Roths Chickbill, but I guess there are some newbies too.
I use only Roths (except in cases where i had to rollover a pseudo traditional from a company i used to work at). I like Roths for three reasons: 1. When you see your balance in a Roth, that amount is yours and all yours. You wont have to do math in your head to figure how much tax you owe. 2. It allows you to save more than a traditional; a critical thing for anyone attempting ER. 3. In the event you actually need some money out of the Roth (eeekk! i know), you can do so with no penality, long as you only touch principle.
IMHO, a person that's trying to max their ER opportunity has no use for a Traditional IRA because of #2 above. Even if the taxes arnt quite as good for your specific situation, the ability to sock away more under tax protection (which the Roth allows, because its "after-tax" money) is a far greater benefit.