I really wanted to get one and I loved using it at the Apple Store, but it is a rev. A and I have been reading about many heat/fan/power supply issues that have kind of made me unsure. Do you guys think Apple will fix these problems now, or would it be safer to buy a rev. B? I really want a new Mac now, but I don't want to pay $1800 and then have to keep dealing with heat and fan problems and getting new parts, ect.