Thanks for the link, there's some good stuff in there.
It's interesting that they claim 4943 can be used where ever 4043 is used, yet I haven't seen any addenda stating that it is in fact ok. I'm not saying it not, I just haven't run across anything yet. From what I understand, 4943 is a relatively new filler metal, so I can see how it might take some time to work its way into the code books.
Thanks again for your help!!