Spread the entire budget out, all expenses line by line for all to see, and may they survive or be culled based solely upon their merits in the eyes of the American people. If the NSF's expenses are justifiable, demonstrate it in witness of the American people like any other line item.
So to use some choice words from our Vice President: "I don't really care." I don't want my taxes wasted on bullshit and I think most Americans agree with me. And if you're against audits, I have to wonder what your motives actually are.