I am curious as to which amp you chose. Assuming that your speakers have a 90dB efficiency rating. You would only need about 1 Watt/channel to drive them to around 80dB at 3 meters so the XA60.5 should provide all the power that you need. See the following link for power calculations:
(www.myhometheater.homestead.com/splcalculator.html)
The advantage to Class A is that there is no distortion due to cross over from A to AB operation so operating at low power output levels won't be an issue. A couple of advantages that the XA60.5 has over the XA100.5 is the 33% lower up front cost and the 33% lower power consumption (200W versus 300W).
(www.myhometheater.homestead.com/splcalculator.html)
The advantage to Class A is that there is no distortion due to cross over from A to AB operation so operating at low power output levels won't be an issue. A couple of advantages that the XA60.5 has over the XA100.5 is the 33% lower up front cost and the 33% lower power consumption (200W versus 300W).