1) IMEI number in post: yeah, I'm an idiot... sorry. Edited/removed
2) I'm not trying to put on a 4.4.4 ROM, but the 4.4.3 one. I realize that the 4.4.4 rom requires new firmware
3) I updated to the latest AT&T firmware with an RUU update after unrooting. For the time being, I was trying to avoid going S-OFF, and then trying to figure out what firmware/ROM combo would work. Ideally I'd eventually like to get to 4.4.4, and I realize I'll have to either have an AT&T firmware, OR use a GPE firmware. Is that right? And then to do that, I'd have to be S-OFF, etc.
But I was hoping there would be a Revloution (or Viper) ROM that I could load on my AT&T phone for right now until I get time.