Hmmm for something more easily attainable, I mean the zmf pendant is a naturally good pairing, it’s spacious, warmer and thick sounding, controlled and capable, overall very nice. If you wanted something more neutral and a great middle ground between tube and ss, something like a linear tube audio mz2 with the lps+ psu is very nice (also would drive the arya better). If you wanted to go for something smoother and more relaxed, the feliks elise mkII is a pretty solid choice. A note on these amps, the spring 2 wouldn’t be the most ideal pick, since because they are single ended, you would only be using half of the dac on the spring 2, the xlr out is higher preforming imo. I would go for something like a lampizator amber 3 with this (as I would say it’s a better match sonically anyways, but size might be a concern).
If you look around you might be available to find a cayin ha-6a which would go very well with what you have (including the hifiman) and would work well with the spring imo, also potentially a used modwright tryst might be within reach and that also goes well with the spring imo
Getting into the range of very hard to find most of the time, a dna stratus or a used eddie current balancing act or studio jr (you might be able to find a zds potentially but this isn’t balanced) would be excellent but that’s probably really pushing it