So, after first thinking I had no use for more domain names, I then decided what the heck and registered two .info domain names for myself to play around with. After some hunting for info on getting OS X to make use of these, I came across this article, which was more geared towards OS X Server, but the steps seemed to work just fine with regular OS X.
I still have my main site served, and currently have one of my new domains returning a dummy holder page. I think I might use this to test out an upgrade to Movable Type, see how things go. Hopefully that info might help some folks out there.