Well Jim, this would be a very tough choice for me... Really too bad that you can't compare and if I understand correctly, you haven't heard any of them.... So:
The Muse is really very good, I understand that you are unfamiliar with it and that probably kills that piece, but I really like this preamp.
The Conrad Johnson and Audio Research we know are good and both sport 2 of the biggest names to ever exist in Audio, so there is some comfort that both of those pieces will be good and you can easily resell... Then here comes Coda, Not the biggest name, but for sure a company that everyone knows is no slouch and offers built in phono.
You know, in the end, One of these truly will offer just a little something to your taste in sound that the others don't, but you have no way to confirm, but I can tell you this, in the end, if you get any one of these 4 preamps, you'll have a NICE Pre. I think all but the CJ offer balanced and single ended. I know the Coda has variable gain inputs. Make the best call that you can and maybe its none of these, but in the end, be comfortable that your decision is sound. These are nice pieces.