I have an MBP that I bought before the MB turned up. I would probably have gone with a black MB had I had the choice. However, I do work with graphics, music and video so it would not have been a good option for me. I need the superdrive as well, which comes with the black MB.
But upgrading RAM on the MB made it cost about the same as the MBP anyway so I think I made a good choice.
Now, should I ever get a spare laptop, I would seriously consider an MB or even a second hand iBook. But that was not the question here.
/E