Halcro's suggestions reminded me---I should have included price considerations. The Ypsilon is worth more than my entire modest system! But thanks guys, I'm now inspired to dig into this deeper myself. Phono amp design is one where the measurements really do tell you a lot about the resulting sound of that design. Atkinson's measurements of a lot of the current phono amps I was referring to in my question reveal that they are not appropriate for any but low-output cartridges, having severe overload and distortion characteristics at high and (especially) low frequencies when fed a 5mV signal. And that includes some otherwise very fine, and expensive, phono amps that are great for low-output cartridges.