My two main concerns are retaining my SMS history and not carrying over too much bloat from old jailbreaks. What I'd love to do is just update (restore) to iOS8 and restore from a current JBed iOS 6.1.3 backup and have everything work fine, but after doing that from iOS5>6, I am afraid there will be some wonkiness not to mention wasted space. So my planned course of action is: back up, restore to 8.1 (or 8.1.1 if a Mac method comes along shortly), follow the instructions here and use iBackupBot to extract my SMS history and merge that with a clean iOS8 back up, jailbreak and basically install everything, apps and Cydia tweaks, from scratch. I am totally open to suggestions of better ways to do what I want to do. And thanks in advance!