Thoughts on my planned audio revamp?

I been doing a tad of research on audio stuff I would like to upgrade to. I want to get quality stuff that will last many years. My current build is simple just Vzr model one headset with just a basic dac/amp in the Schiit fulla. My current plan is to do a big upgrade for headphones and slight/ moderate upgrade for dac and amp. The build I plan on saving for atm is the Arya stealth headphones, Schiit Modi for dac and for the amp I’m thinking of is the DROP + SMSL HO150X. What are everyone’s thoughts on this combo/ setup? I plan to use it for just about anything and everything from simple listening to personal production and gaming being the main ones.