I can suggest Crestron 12x60 or 16x60 models that are made by ATI and you can find them used at ridiculous prices. The best value for money i know for the mini and this approach can lead you to the 521.4 using the same amp.
These are very high quality class AB amps. IMHO though, the ultimate is the neurochrome diy amps but are quite pricey to build. Also class AB, with vanishingly low distortion.
ASP all the way. You can get and assemble the diy version for very little money. Bit you need to have a top source with volume control in order to take the full effect of the asp.
My 2 cents
These are very high quality class AB amps. IMHO though, the ultimate is the neurochrome diy amps but are quite pricey to build. Also class AB, with vanishingly low distortion.
ASP all the way. You can get and assemble the diy version for very little money. Bit you need to have a top source with volume control in order to take the full effect of the asp.
My 2 cents