Headphone amp upgrade guidance

Hi! I could use some input and guidance on a good upgrade path for my headphone setup with a new amp.

Current gear (I bought them all used):

Cambridge CXN100 Schiir Freya+ preamp w/Sylvania 1955 GTA Tall Boys Schiit Magnius headphone amp Hifiman Arya Stealth

I like this setup bc I can get the best of both worlds with the Freya+ if I want tube sound, which I like. There's synergy with theschit gear as well. I also have the option of using the passive/buffer stages of the Freya or I can use the Magnius on its own.

It's a very nice setup but I'm wondering if it might be a better idea to simplify the signal path and get a dedicated headphone amp with its own tube stage.

Or, if adding a new solid state headphone amp to the existing setup could be that much of an improvement from the Magnius which I believe is from 2020?

Budget: I wouldn't want to spend more than $500 or so.

At that price point what's a good upgrade option with balanced connections? I'm not sure what I want to do and could use some help choosing!

Thanks and have a great day! 🤠