Hi, well I decided to move to the Mac OS camp. I've never had an Apple computer before. So I'd like to know some things first. How bad is the heat issue really? Currently I have a Centrino Notebook, which means I'm not really used to heat, or at least so I think. Will it be a dangerous for the MBP to run for more hours a day without turning off? Noise? I have a problem with my left ear (tinnitus). It actually amplifies certian high pitch sounds so that they are even more distracting. OK to the more technical questions. I'm deciding between a 100GB 7200 disk over an 80GB 5400 and 1024MB of RAM over 512MB RAM. I'd like to use the Boot Camp option to boot WinXP as well. How important is RAM in daily multimedia usage (internet, music, dvd, maybe same games) in Mac OS? I'm thinking of going for the faster HD, as I assume that it's easier to upgrade the RAM, than change the HD. THx for help.