I just noticed the cool looking 400 & 400M amps on the Classic Audio site. I had frankly forgot that these models even existed since the 140, 250, & 500 amps tend to get discussed more. The 400 series seems to be fairly rare, with low production numbers. Anyone here own a 400 or 400M amp? If so, how do you like it? I like that they weigh less than the 500, but appear to be just as musically capable. One reason why I'm inquiring is that I just scored a pair of Martin Logan Aerius speakers from Craigslist. They were for sale right in my own town and priced right. That made it a no-brainer. These speakers are awesome. Right now I'm driving them with my Marantz 1250 integrated amp, but I get the feeling that they could use more power. Your thoughts? Regards, -rick.