HTC One X
AT&T's HTC One X is still the carrier's flagship Android device and for good reason. It combines a fantastic camera, speedy processor, and a high definition display that ranks up there with the best available on the market.
It also features 4G LTE data speeds which means that it can pull down data speeds that are 10 times faster than typical 3G. The HTC One X is also set to get Android 4.1 Jelly Bean sometime this month which will only stand to make it a much better smartphone.
Those that don't need the horsepower of the One X+ will be find with the One X. It also helps that it's a mere $20 right now on Amazon.