What do you do if you've been selling what's arguably the best superphone on the US market and the competition is heating up? Make it better, of course, and that's exactly what HTC's done with the One X+ for AT&T. This is the same improved handset we recently played with in the UK, but unlike AT&T's One X -- which dropped the global model's quad-core Tegra 3 with 32GB of storage in favor of a dual-core
