You seem to have hit the topic upon it's pointed little head. Sometimes the bottom line depends upon the depth of the green valley we sit on. A quick glance at the McCormack amps for sale (here on Agon) shows a 4 to 1 or even 5 to 1 ratio (between the 125 and 500). I guess when you have the need for 4 or 5 real good amps and just can't miss another meal (or payment on your beemer), the 125 would just "have" to do. Lets see now, where did I put those Apogee Full Ranges ?
It all just boils down to ones tastes and budget (usually not in that order). I like McCormack equipment. I am now on my THIRD TLC (although my first was a "new" Mod Squad Line Drive). Today I am anxiously awaiting a Philips CDM 12.1 for my older, inoperable McCormack SST-1 Transport. I hope that it works. I hate to see the thing go.
Back to the thread, I think that if money is an issue, and the only choice is between the Belles and McCormack, I would pick the McCormack. The Belles has its strenghs, but the McCormack always leans on the side of music. It is the "pace" and finite quickness that shows through with the McCormacks. It's the little things (the McCormacks have) that make musicical nuances an individual fraction of the art as whole. I have always found that in McCormack equipment. I found it in Belles as well, but not to the degree that the Mac's have it.
Just my 2 cents.
Tubby