The site looks really good. The new header image is really clean looking. There are only a few things I would fix (Some of these may fall into your 'spacing issues' category, but I will say them anyway.):
- The main table looks like it is about 10-20pixels too wide. Make it shorter so that it 'meshes' with the header images in width.
- I would change the white edge around your header image to transparent or just make it the same color as your background
- Some of the menu buttons have text that looks "pixelated"
Everything else looks really good! Keep it up!
