#1 - I would use one button set and not 3 different ones

. Having all 3 makes things look quite odd on your pages, just something minor though.
#2 - Ditch the black and go with another color of blue or maybe grey. Black/Blue is not a bad color scheme, but it does not seem to be working, at least not in its current form.
#3 - When making a header, unless you expand it all the way, making it the same color as the background would be best when possible.
THe above is not to put you down, merely to help you out