I already have a iMac, iPhone and AppleTV. I'm looking at getting the white 2.2 GHZ MacBook with 120GB drive. 1. I have a .Mac account. When using back to my mac, does my iMac at home need to stay on all the time so my MacBook can access it? I don't like the idea of leaving my iMac turned on while I am away. Would my iMac wake from standby mode and go back into standby when I finish? 2. Would it be better (and cheaper) for me to get the cheaper 2.0 GHZ Macbook at $1099 and upgrade the hard drive? Seems like the extra $200 for the 2.2 GHZ processor and the Superdrive is worth it rather than upgrading. What do you think? 3. How much faster is the 2.2 GHZ version really? Is it worth it? I do plan on editing some Hi-Def video and working with photos. Will it be as fast as my 20" 2.0 GHZ iMac? Thanks for the help.