jtara brings up an interesting point, which was in fact the next area I was going to cover. I have a question regarding an additional site (not the one I'm discussing above), that relates to DNS setup and third-party DNS costs specifically, and best practices with A Records and CNAMES. I'll split that one off separately to this thread...
A Records vs CNAMES in fail-over DNS
prefer A Records, but charges for monitoring are per A Record
Would still appreciate thoughts to my last question, though, on slaving the primary and secondary servers (for non-third-party DNS setups).