The obvious one to try with the Capella is the Caiman SEG with Dorado and Superclock upgrades. Stan allows returns if you don't like it. I used a Capella for a while as a preamp but, compared to a passive preamp, it had a veil over the sound so I sold it.
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Cheers
Alastair
RPI4/PI2AES running PiCorePlayer/LMS-> AQ Carbon AES -> Topping D90 DAC-> Khozomo Passive Pre-Amp -> 4x Temple Audio Monoblocks powered by 2xLiFePO batteries->Van Damme Black Bi-Wired to B&W 804 Nautilus and Sommer Carbokab 225 Interconnects