Go and check out MPI by suncor financial. Download the free book and look at the section of ira vs roth. You end up paying the same taxes and the account values are the same after the taxes.
1 dollar roth grows to 10 at retirement you take 10 tax free
1.3 dollar ira grow to 13 and you take out 13 and pay the same 30 % taxes cause lets face it we all are gonna not be down much in brackets now. You still have 10 dollars.