Yeah, I agree with Yikes. It sounded good. 
 
Unscientific testing, but I put my hand on the B-52 while listening and it wasn't hot. 
 
As for cost, I don't see how it's inconsistent. Dynamight or GS-X are the cheapies of this class. Maxed out SDS XLR is the expensive one. The rest - B-52, balanced Maestro, balanced Max - just fall somewhere in the middle. 
 
Actually, now that I think about it, the balanced Grado amp is the cheapest. 
 
Best, 
 
-Jason