I forgot to mention that I do have Xindak Power Cords for all of my equipment. They appear to be 10 guage (thicker than a garden hose!) These are very nicely constructed cables that would be comparable to $250-$400 power cables.
Ckoffend if you get a chance, try one of the W4S amps or integrated amps. I would be interested to hear if you have the same issues about them running out of steam. With the Maggies, the STI500 has the sense of unlimited clean and clear power. Really amazing.
By the way, looked up some of the amps you mentioned. Both the Krell and Mark Levenson looks like a battleships! I have seen Pass amplifiers and they were the biggest boxes I have ever seen in my life!
I do like the sound of Class A amps and believe they, like tubes, really provide more sound per watt than Class A/B. In addition, I think the W4S is very close to Class A sound (once I update some cables I think that they will take another step up - remember I am currently using a $140 cable and source is a $350 Netgear 9150). As of now, the W4S blows away the Class A/B amps I have listened to, especially at high volumn levels.
Here is my argument for Class D vs Class A:
Cool running!
Unlimited feel of power
Smooth, never harsh
Low power consumption (I leave my amps on ALL the time)
Small footprint (about the size of a preamp)
Better depth than my previous amp
Three dimensional but not yet up to my previous amp running in Class A mode where you feel the performer in the room
A fraction of the cost of a comparable Class A amp (less than 1/3 to 1/10 as much)
Truth be told, if inconvenience was not an issue, I would choose a Tube amp in the 100 watt range over a Class A or Class D amp but after all the issues you have to go through for tubes, I decided it was not worth the trouble.