I would say that the K-member is ready along with the UCA, Strut Arms, etc. We had a bit of tweaking to do on the LCA's, and that was simply to be able to obtain proper ride height for a more aggressive set-up.
If you are serious, just give QA1 a call and make sure your questions are answered.
I am running the complete set-up now (with in house mods to the LCA's) and it was a massive improvement in feel. We were just waiting for the factory LCA's to get here and we are also testing an 1 3/8" bar.