I'm fixed! I read your post and decided to give this a try. I ran Matt's 1.82 Step 1. That removed the encryption data error and put the phone into a bootloop, but it did put whatever was needed onto the phone from ICS to run the upgrade to JB. So, my phone was hard to see rebooting it was just alternating between motorola logo and black screen. I experimented with when to press power and two volumes to get to the stock recovery menu and it took me a few tries but I finally got there. Once there I chose "apply upgrade from external source" because I still had the JB upgrade on my SD Card. It ran the upgrade and I am back! I'm now on JB 4.1.2 only I am now no longer rooted. If you still have your upgrade on your sd this would probably do the same for you.
Thanks for the write up! I just came back to update that I did the same and had success, now I too, need root and safestrap. I have learned (the hard way) to always keep the latest ota on the sd card.
Great thread/knowledge base... Thanks all!!!