If you can get the McCormack more power to you.
My thoughts drift to McIntosh power amps, you would be forced get an older one with about 200 wpc. You might be able to find one on your price range. Yes it would be a vintage amp but if you buy from a good dealer AudioClassics etc. you might be surprised. No one else has even attempted a suggestion - so either settle for a digital amp or an older one. What you really seem to want is a fairly high power class A SS amp for class D money. You might be able to get away with less power and you could play around with highly class A biased amps but they sound class A/B to me. And some amps just sound good regardless of class.