Is all the hype warranted

   SET is an acronym for single-ended triode.  It is a very simple circuit that permits a single output tube per channel.  While simple might suggest low cost, this type of amp requires a special type of transformer that must be large, and therefore, expensive.  Most SET amps are very low in power output.  While I don’t agree that any one type of amp is superior to another, a lot of listeners think that SETs are the most natural and best sounding of amps if you can deal with the low output.
   There are SET amps that employ very high voltage transmitter tubes to achieve higher output, but they tend to be quite expensive, operate at high voltage that might be dangerous, and for my taste, they don’t sound as good as the flea-powered tube types like 45, 2a3, and 300B SETs.

@OP. There are other USA made affordable tube amps to consider such as Rogue audio. Despite your loudspeakers' relative efficiency, you might want more than forty watts per channel in your quite large room. SETs definitely need not apply unless all you want to listen to is harmonic distortion.

@yoyoyaya your comment about harmonic distortion may apply to some very low powered SET amps with mis-matched speakers but it certainly doesn't apply to the majority of SET amps. Certainly not the one I listen to daily. It would be the equivalent of describing non-SET vacuum tube amps as "unless all you want to listen to is varying degrees of negative feedback". 

...probably not, but loud noises tend to draw attentions.....which are, thankfully short...;)