After a canti frame really that I can just swap all the bits on to from my current 80mtb conversion. Disc upgrade option would be nice but I can't see my current wheels dying any time soon and I love my 3x10 thumbshifters.
Another MTB frame might do but I'm after touring bike levels of stiffness.
I have never heard of LKLM bikes, but the Marin Larkspur might be a good alternative?