I just signed up for Republic Wireless as well. Got the Moto G with 16GB. I didn't even know they made them with 16MB
Also, the Cell,text and 3G data plan is $25 not $20. I'm on the $25/mo plan. Should add that if you get a Moto X, there's a $40/mo plan that includes 4G LTE data.
There are two problems with the service I've run into:
1. Short codes via SMS don't quite work yet, though they're working on it.
2. I can't roam in the Colorado mountains, despite coverage maps saying I should be able to. They're working on it.
Great service otherwise. The automagic WiFi calling is amazing, especially in my basement with poor coverage from Sprint.