JM Labs 927 Be vs Sonus Faber GPH also the 937BE

Well, I assume you are going to audition these speakers, so the confusion should stop once you hear them playing your music, through your own system, in your own room. (If you are going to buy new, an audio store should allow an audition in your own home, and they should set up the speakers for you). If buying used it is trickier, but you still have to at least hear any speaker you are considering in an audio store before you buy them. That will help your confusion – no one else can tell you what will sound good to your ear.

For a room this size, I would forget the GPH and go for Cremona Auditors if you decide on Sonus Faber over JM Labs. This is a far better speaker, and is going to be cheaper than the 937BE and around the same price (roughly) as the 927.

If you like Sonus Faber GPH, the Cremona Auditor does all that the GPH does, except much better. I personally think the Sonus line is a bit more musically versatile than the JM Labs. Specifically the Cremona Auditors rock much better than my Electra 926's. But the JM Labs are excellent speakers, and I believe this is particularly true if you are using tube gear. Nothing I've heard beats JM Labs for well recorded female vocals, for instance. But I find them quite unforgiving and not that well suited for some of my music collection.

To be honest, though, neither the JM Labs nor Sonus Fabers are my favorite in the price range. For me, the best is the PMC OBH-1. This is a wonderfully accurate British speaker without a characteristic "audiophile" sound. They do require a pretty powerful amp to drive them, and tubes are really out of the question. But check out some reviews, and much more important, audition a pair if you get a chance. (There is an interesting thread here comparing them to ATCs that you can search for.)

My typo, make that the PMC OB-1.

Well, I need to back track from some of my statements above, having just had the Sonus Faber Cremonas (9k) home for a weekend audition. It made all the difference. While I still do think they rock a bit better than my Electra 926's, there is no question but that the 926's are better sounding overall (to my ear, as always). Based on auditions in the store, this surprised me. Given that the Cremonas are much better than the GPH, and the 937 be is better than my 926's, I think you unquestionably made the right decision. Congratulations and enjoy!