I'm in the market for a new Macbook. I want something with a battery that lasts longer than the two hours of my current 2007 MBP, and I want a smaller machine for the ease of toting it around. Best Buy has all their Macs on sale for $100 off right now, and I'm tempted to pounce on them before the sale ends. Do you think it's a better idea to wait until Yosemite comes preinstalled on all Macbooks (and potentially losing $100), or should I just bite the bullet and upgrade-in-place when it comes out later this month? Written by a guy who's still clinging to 10.6 since his hardware chokes on anything newer.