Charles1dad, have you heard these amps with the GH's? I admit I have not, BUT I have heard several low powered 300B amps with these speakers that are clearly a poor match . What you end up listening to is basically distortion. I think YOUR advice is actually very poor IF you haven't heard the amp/speaker combo that the OP is asking about. My suggestion, IF you read my post, was for the OP to try and hear the Frank/GH combo for himself and then decide. That is really the only way that I know of wherein one could be absolutely sure that the combo works well enough for the OP's taste.I agree that numbers don't always tell the whole story, however, as I own the GH's ( Do You also?) I know that these speakers do NOT work well with lower powered amps and are NOT that easy to drive ( Plus, I have a much smaller room than the OP!) So, a safe bet would be the Dragon's and the Frankenstein's a very questionable choice, IMHO ( regardless of the transformer and PS).
BTW, your point about numbers also applies to your statement that the GH's have a very favorable load and phase angle ( aren't these numbers?)