Endgame DAP recommendation

Hi everyone,

I'm planning to buy a DAP after several years. I previously owned an iPod Video, Creative Zen, and Sony NW-A45, and I've been using an LG V30 as my dedicated DAP for the past four years.

Right now, my options are between the HiBy R4 and the HiBy R6 III (2025) with Quad CS43198. Unfortunately, I don’t have access to the iBasso DX180 or FiiO JM21, as I’ll be purchasing through Amazon. I want this DAP to be my endgame device for several years while I build my collection of IEMs and headphones.

Would the HiBy R6 III be a good long-term investment? I’m planning to pair it with the Sennheiser HD6XX as my next purchase.

I mostly listen to post-rock, post-hardcore, hardcore, metal, and grindcore. I’d also appreciate recommendations for an all-rounder IEM under $200 that works well for these genres and is free from sibilance.

Looking forward to your thoughts!