I could use a percentage based width, but then the logo alignment wouldn't be as nice. I think it's pretty good, unless you're running in 2048x1536 or something. It looks perfect in 800x600 or 1024x768. 1280 would probably look good too, while 1600 might start to look somewhat small, especially if you're using a 15".

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram