I recently setup Spendor S3/5s in a 14x16x9 study, where the speakers must be less than ideally place along a long wall. Rogue Tempest Magnum and Audio Aero Prima completed the sysem. Now I listen to this setup more than my main system.
Sorry I can't compare the Spendor's to any of the speakers on your list because I haven't heard them. But if you put a premium on musicality and low listener fatique, the Spendor "Classic" line is tough to been IMHO.
Check out Herb Reichert's review on enjoythemusic.com: "...I am getting old, I've been around the audio block a few times and I think this $900 (!!!) loudspeaker is going to end up as one of the small handful true audio classics. What it doesn't do is play loud or play bass notes below 70-80Hz. What it does do, which is deliver superbly transparent, extremely detailed, authentic sounding music playback -- it does better than any small speaker I have ever heard -- period! Yes. You heard me right. My use of the word "any" includes speakers like Wilson's "Watt", the ProAc Responses and Tablettes, the Sonus Faber Concertos ..."
Happy hunting!