I am waiting for my 15" i7 macbook pro to arrive, and I'm looking at which 7200 rpm hard drive to buy to replace the 5400 rpm one with. I've narrowed it down to the Seagate momentus xt and the Hitachi Travelstar 7k500. Not only speed is important, because from what I've read the Seagate is a bit faster. But what i'm more worried about is noise, vibrations, heat and battery life. Which would get me the closest in those aspects to the default hd but faster? I know there are a lot of threads about this, but I couldn't find one just comparing the two in the aspects I mentioned.