Just a thought for you on the ARB vs E-Locker debate: I've been running an ARB in my 8.8 rear end for probably 5-6 years now. It has been good, but I think if the day ever comes where my ARB takes a dump, I likely wouldn't run out and immediately replace it with a new ARB, but would strongly consider an E-locker. Here's why: about a year after purchasing the ARB I had to replace the seals in the seal housing because they had already worn out. Not sure if that was installation error on the original install by the shop or what, but either way, I had to replace them. It is not an expensive fix if you do it on your own, but takes a decent amount of time to do it, maybe the new ARB design has addressed this.
2nd thing: I've found that when using it in cold weather, it sometimes will cycle the compressor every few seconds. I assume this is attributed to moisture accumulating in the solenoid and freezing because as soon as I am no longer in freezing weather, I do not encounter the issue. Not a big deal as the locker still seems to be engaged, but more just an annoyance. My Detroit in the front however, never had a problem, works great.
Both of these would have been avoided had I gone E-Locker originally. My .02.