I disagree with Abstract7 there are plenty of amps in the $2000 used price that can drive the logans. Sonic Frontiers Power 2 at 110watt is one of them. A good 100 watt 6550 tube amp has more then enough juice for Martin Logan. And Martin Logans always sound better with tubes. Other wise the sound is too solid state smooth which can get boring fast. I would advise to stay away from Levinson or Krell or with these speakers. They just sound too bright, another amp to also give a listen to is a used VT100MkII again this also has plenty of juice to properly control your speaker. As far as the 1.3ohm min thing, thats BS, you can drive a Martin Logan with a $400 receiver and it will play plenty loud enough, maybe not with quality, but it will drive them. The logans are very easy to drive in my opinion and in my room with a Sonic Frontier power 2 I can get peaks of 110 from my speakers. So goes to show you that 100 watt of tube power can drive anything.
