That's a good question for theadvancedapes as I seem to recall him writing a price about the JW Telescope. Or am I mistaken?
Yes, I've written about the James Webb Space Telescope before. With the JWST we will be able to see exoplanets within 25 light years of Earth. We will also be able to study the very first stars and galaxies that ever existed. Computer models suggest that these stars and galaxies existed 200 million years after the Big Bang. At the moment the oldest stars and galaxies we can observe existed between 500 million - 1 billion years post Big Bang. Understanding how these earliest of large structures developed will be key to verifying Big Bang cosmology. I just wrote a piece on Big Bang cosmology today if you want to check it out. To your question, there are so many awesome projects we could accomplish with a properly funded space program. I am a massive supporter of a man-manned flight to Mars and going to Europa. I think Europa is the best bet for life in our solar system.