Thank you for all your responses. You've definitely given me good stuff to think about.
There are only a couple of faculty who share my same AOI as their primary interest at the PhD program I was accepted to. Neither of them teach graduate classes in my AOI, so there aren't many classes offered that seem appealing compared to the ones offered in the MA program. I'm also concerned about the working conditions and quality of life at the PhD program, but I'll be visiting soon to get some of those questions addressed.
This is a very confusing process, but I feel relieved that I'll be studying somewhere in the fall. Thank you again for all the help!!