The question is not what current you wants but what will future you want. How long will you expect this purchase to serve your needs? 3 years, 5 years, more? If less get the 16g, if you are thinking 5... you might want to consider the 32.
The money you spend today could be money that keeps you from buying a new one sooner because it no longer serves your needs. Apps will always grow in size and you may find that you like doing more than browsing, emailing, and reading the news.
You should also know that I am always opposed to buying the cheapest option. It is not my nature. Even when I had no clue what I would be using it for I never even once considered the 16gb model. Probably a good thing since I just passed the 19gb mark. Granted 5gb is photos but still...