As for the sheath, there is a leather one that came with the Charge if I am correct. I have it and it holds the tool, bit card, and extender with one side loop extra. I cannot recall if both bit cards will fit. I'd imagine this sheath would last quite a while.
I like the al vs tti and I too like 154cm over s30v. Weight different is negligible. But the al feels better in the hand.Good luck with the ARC. I'm not a fan of the free series. They seem wildly overpriced to me.