If affordable phones, unlimited 4G LTE data, and no contracts are all things that appeal to you, then today's announcement from MetroPCS may be of interest.
For starters, the pay-as-you-go company announced the LG Motion, a new mid-range device that will run on its 4G LTE network. It didn't give a lot in way of specs, but the device features a 3.5" display, 1.2GHz dual-core processor, and Android 4.0 for $150. Small, powerful, and more affordable that other carriers' on-contract pricing. Not bad.
More interestingly, the company also announced a new all you can eat 4G LTE data plan for $55 per month for a single line.