My bad, misread that, they are very close sounding amps though.
So actually for your aeolus, something like a hagarman tuba is a great match imo, real nice stuff. Improves timbre, makes the headphones a fair bit more spacious, and just more natural overall imo with more detail. For the arya, that violectric v280 deal is pretty sweet on massdrop atm, that would be damn sweet (also again more detail). Crazy good control throughout the power range, very nice soundstage and imaging, and great timbre to boot. Dac wise, going for a bifrost 2 if you wanted something a bit more relaxed or an ares II for something more energetic would be great imo. Both would improve presentation, give better timbre, and do an excellent job at reducing harshness and also more accurate sound