I found some nice AC/DC converters from Jameco Electronics, which are fairly high current switching ones. I got a 5V@3A one for $10. This allows me to put this in the case, and have the entire system be powered from the AC power input. No more external wall-wart!
Also, my Photon sense PCB is at the fab. That will have 2 NeoPixel outputs, 1 thermocouple, 1 controllable USB, and 1 DHT22 Temperature and Humidity sensors. I have gotten the parts already in the mail. I'm glad the AC/DC converter worked well, because for the NeoPixels, I'll need a lot of 5V current.