well im gonna step out on a limb here & go against the grain,out of all the amps mentioned here in the wattage range your asking about i like the mc7106,300x3 @ 8 ohms, no autoformers.
the 7106 blew away my mc300 & wasnt that far off from performing as well as my mc252,the mc7104 is also a fantastic sounding amp with 200x2 @ 8 ohms.
for the price they sell for used you cant touch another 300 watt mac amp & they perform as good or better that the 2 channel amps.
aside from the mc1201's that im running right now the mc500 was my next favorite mac amp.
the 7106 blew away my mc300 & wasnt that far off from performing as well as my mc252,the mc7104 is also a fantastic sounding amp with 200x2 @ 8 ohms.
for the price they sell for used you cant touch another 300 watt mac amp & they perform as good or better that the 2 channel amps.
aside from the mc1201's that im running right now the mc500 was my next favorite mac amp.