Hey Garth, I listened to both a while back when I was searching for speakers.
Here some links to my thoughts at the time:
Adagio Song Towers 2nd review down
I made a quick comparo
hereYou may find some other useful information in that
thread, several options under $2k are listed if nothing else...
Off the top of my head I would say that the two speakers have a different character, the Adagio's being the more aggressive of the two... on a couple of different levels. But it's been a while since I heard either of them, my old words are better since they were written shortly after hearing the speakers.
Bottom line is that you should try and audition both of them, and let your ears decide. Both are excellent speakers.
Good luck. Cheers.