AT&T has no shortage of value-priced phones, and just lately, a pretty good selection of 4G LTE devices as well. But the two haven't crossed over much yet, and the ranks of Windows Phone 7 devices are a little slim as well. Happily, all three of these categories can add the Samsung Focus 2, which goes on sale starting today for $49.99 with a two-year contract. Is it worth your hard-earned greenbacks? Let's find out.