Here's a fun fact: in the three months since Windows 8 went on sale, Engadget has reviewed 16 laptops, including a few hybrid form factors. Yep, that's right: more than one a week for the past 12 weeks, and that's not even counting a couple tablets running Windows RT. So, now that we've given over our collective social lives to writing about Win 8, we finally feel qualified to make a few recommendations. Here, in our first-ever laptop buyer's guide, we'll walk you through the most promising of the bunch -- everything from convertibles to lapt