Hi Wflm,
Would you need to change amps if you change speakers, even if they are still Avalon models? I have found that a change in speakers usually caused me to first embark on finding appropriate amplification, if the amplifiers I own at the time of change do not mate properly. I would also add that in my setups, the change of preamp has returned the most dramatic difference, following the speaker/amp combo. Digital setups have varied but the differences are not normally that dramatic or drastic. I currently own the dCS Paganini synchronized with an Esoteric rubidium clock and the MPS5, among others. Differences are material, significant and I have more than one on hand for preference and choice, keeping my other gear constant.