If I had the money in my hand and wanted some tower speakers I would get the Monitor Audio M6 speakers or the PSB Image T5 speakers (Audio Advisor website).
IMO they are better-sounding speakers than the ones you mentioned.
The Magneplanar MMG, for $600, is probably better than any of them, but you need at least 140 watts at 4 ohms to run them and they are much wider than towers; 15 inches wide. They take up space.
If I had the space for them I would buy the Magneplanars in a heartbeat; they are jaw-droppers!! Simply awesome.
They ALL need a good sub!
Originally Posted by batter
I like what I read about the Arx line, but I now see a pair of Martin Logan Motion 12's on sale for $600 and wondering if I should jump on that instead.
Any advice / recommendations ?