I will chime in again. Your speakers are two-ways with maximum power handling of 175W RMS. In-room sensitivity is 88db with a 4-ohm minimum impedance. Both the M700 and S300 can provide ample power to your speakers while remaining stable.
Your Arcam A80 originally retailed for in excess of $1k. With that in mind, you could trade it in to PS Audio and receive an $840 credit toward the Stellar DAC-Pre / S300 combo resulting in an out-of-pocket cost below $2k. Assuming you are also entertaining new DACs based on your original post, I believe the Stellar DAC-Pre / S300 combo would provide more thrills and enjoyment with your Mirage speakers than the Arcam A80 / M700 combo. The Stellar DAC-Pre has so many useful inputs, and you may really appreciate the ability to connect the DAC-Pre to the S300 amplifier using XLRs. A very quiet and robust connection.
Others may have switched from the S300 to a pair of M700s, but your circumstances and the corresponding "best bang for the buck" may differ.
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