Entry level should have been 32GB, guessing/hoping this will change next year. If you are worried about running out of space then get the 64GB. Depending on how you plan on paying for the phone, it's $100 + tax more upfront or just a few dollars more per month (ie AT&T Next).
It's too brilliant on apples part!! I don't think they will do away with 16/64/128 gb for a long time!