Updates to this:
First, I got test strips that include GH and KH. I know strips aren't as reliable as liquid, but this is what I could get for the moment at a store near me. They show GH at 75ppm (about 4.2dh); and KH at 20ppm. So based on some Googling, that should be pretty good for Blue Ram happiness. It also seems to corroborate my tanks self regulation of pH at 6.8 (one largish piece of driftwood seems to help keep it there). So unless these strips are way off (they are at least well within the printed expiration date) then I think all my parameters about right for Rams (once I bump the temp to 80*F). Please correct me if I'm wrong on this, though!
Second, a little research turned up a LFS in the St. Louis area that supposedly breeds their own cichlids. I called and they said they have Blue and Gold Rams. Another LFS actually recommended them to me especially for their quality and knowledge of cichlid stock. They advised me to bring a sample of tank water in so they can check it for compatibility. So that way I will also get confirmation of my test strip readigs. If the hardness readings are off, then I'll have to wait until I lower it before buying a fish. I will probably head over there tomorrow evening to check it all out. If all looks good, then I guess I'll be trying one again with a Ram. I'll update the thread with a progress report.