If you wait until 2013, Mac OS X 10.9 (Lion) should be out. By that time, Macbooks should be cheaper in price, and will have 1 tb flash-based hard drives, along with standard quad layer blue-ray hd disc drives. The battery life will be 48 hrs, even during dvd playback and 4-d rendering (steve jobs will conquer the whole "time" issue in 2009). it will also come in an assortment of colors and flavors. Oh, and it will be available immediately after ordering, what with the beaming technoogy that was adopted from star trek
Seriously, though, if you need it right now, buy it now. If you can wait, then wait. Same response tht everyone gets when they ask the question...