I'll answer my own question, and give you all (who live in the USA) an FYI, I ordered my Cricket Wireless Nano sim 2 days ago, it came in today. Super easy activation, instant access. From my house it switched to 3G, I called customer service since I am clearly in an LTE area. They said 2 towers were getting upgrades, and for my trouble, they gave me 5$ credit. Now that's service! Right down the street LTE comes in like gangbusters.
If your looking for a good non-contract place to park your unlocked HTC One (M8), take a look at Cricket wireless.
It's cheap and includes intentional features, and utilizes AT&T's great LTE network.
Hope this helps some of you!