Who should McCain choose as his running mate?

I was looking at the CNN website special area “America Votes” and noticed this (http://edition.cnn.com/2008/POLITICS/03/27/possible.vice.presidents/index.html) and it got me to thinking who John McCain should choose as his running mate. I’ve read through most of the candidates and to me the obvious choice would be Mitt Romney. Firstly, because I wanted him to be the Republican candidate, and secondly, because he would gain the conservative vote that McCain is so obviously lacking. I’d quite like to know what other people think, and I’m sure everyone will choose to disagree with me!