I would buy these speakers: http://www.audiogon.com/cgi-bin/cls.pl?spkrfull&1294260628&/JM-Labs-Mezzo-Utopia-Loudspeak.
Their current cost would be around $30,000 at least judging from the recent inflation of audio equipment prices. They use the same tweeter as Wilson uses[ although Wilson claims to modify them]. I had a pair of the Mini Utopia from the same period with the same tweeters and they were excellent. I sold them for exactly what I paid for them. I have not bought a speaker on personal audition since the early 60s; when I have heard some prior to purchase I have bought them DESPITE the audition, not because of it. It is really hard to hear speakers in anything like a home environment, most stores do not have good acoustics. I would buy something like these speakers and live with them for a year or two, you may want to keep them, if you don't you will have a much better idea of the sound you are looking for. In any case you are not likely to lose money. I don't understand why the 275 would be good for the summer months, most people want a SS amp for summer because of the heat. I like the 275 better than the Mac SS for what that is worth. I have absolutely no connection with the seller above, they just look like a good deal to me. I recently purchased a pair of speakers used and unheard and am very happy with them, but I know pretty well what I am looking for. Live with a really good speaker for a couple of years and you will too.