While I respect both of your choices, I put my money on the McCormack DNA-2 for my 3.6's. No regrets.
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Probably the InnerSound ESL amp would be the better choice. It will drive virtually any current commercial loudspeakers very well. I've used mine with the InnerSound Eros, B&W CDM 9NTs, and Maggie 12QRs and the amp was virtually unflappable with any of those (at very healthy volume levels). It's really a nice thing to be able to play your system as loud as you please and not have to worry about clipping or amplifier failure.
I had the Innersound amp with my Maggie 1.6's for the 30 day trial and the sound was very immediate and dynamic and they played very loud, not in the typical way that Maggie's sound, more like dynamic speakers (in a good way). I could not believe how loud those speakers would play. I also tried the Innersound speaker wire which was quite a bit better than the Nordost Blue Heaven I had at the time.
I sometimes wish I still had that amp but went to a Plinius SA100 MKIII instead which was partly because I could get one for $1300 less. The Plinius is warmer and seemed to have better harmonics or tone but the Innersound had that very appealing immediate quality which was hard for me to let go.
I posted a thread about the Innersound with Maggies which had a variety of responses (about 35 responses I believe) in short I recommend you give it a try, you might keep it.
let us know how it goes
I should expand a bit on my first response. The maggie dealer where I purchased mine is a Classe dealer and I thought they sounded good together. If my choices were limited to the two you are considering it would be the Innersound. Not only is there the 30 day trial, I think they refund shipping too. That is a good indicator they don't expect many returns.
The fact it doubles output wattage, 300w to 600w from 8 to 4 ohms is another thing I would look for in an amp. You will also have a new amp warranty compared to buying a used one.
What power cord do you plan to use with your new amp?
Just this morning the Airborne delivery man brought me my new amplifier. It was recommended to me by my uncle (I was somewhat sceptacle). We put this amp up against his FPB300. The FPB edged it in power, bass, clarity and depth. But only by such a marginal amount that I was shocked. My new ESL was only slightly lagging behind his Krell. The best part was that my uncle agreed. This amplifier has plenty of power, and a very nice sound. WAY TO GO INNERSOUND!!!