Per this thread, I am facing a choice between jailbreaking 4.3.5 or going to 6.1.3 with only a tethered jailbreak being possible:
http://forums.imore.com/jailbreaking-unlocking-hacks-themes-mods/260369-upgrade-ios-6-1-2-not-6-1-3-a.html
If I choose to upgrade to 6.1.3 and do a tethered...