Okay, so I've been following the brouhaha regarding the selection of the next Doctor. In an effort to add something new to the debate, I decided to examine the problem as I would a design problem (I'm a graphic designer by trade). So, let's look at what we want and expect in a Doctor, and allow that to direct us to the desired appearance:
Additionally, we like a Doctor who is playful, who can be annoying but knows just the face to pull to make it all okay; who extends empathy and understanding toward us, but still carries an air of mystery; who we watch going about the business of being the Doctor, thoroughly entertained by those antics; and who we grow to love such that our hearts are heartbroken when he leaves but our hearts are so open we accept the next Doctor into our lives, no matter how reluctantly.
So, with all that, I realized this isn't a question of race or gender, it's a matter of species. And we've picked the wrong one. So, my suggestion for the next Timelord...