What about this amp?



http://www.pathosacoustics.com/newclassiceng.htm

It used, at the same price as this one new:




What would be a better choice, when looking strictly for SQ?

Will be used with Martin Logan ReQuest (90 dB/w/m 4 ohm nominal). I only need to play max of 70 dBs (usually around 65dBs).