i have mostly 16bit flacs. but have some SaCDs too.
i ll use it mostly in bus. not loudy as streets i think.
my preferred device is zx100 with sony XBA-Z5 headphones. also have Fiio E6 amp.
ofcourse there is better options then sony players but i think other devices cost me even more. for long years i trust sony's quality and its just enough for me. example my walkman still works that i bought at 98. and my discman works just fine over 15yrs old.
im not an ''audiophile'' for sure but i want to listen better sound with an easy portable setup.
Well, it seems that you've got a pretty good setup here with XBA-Z5 and Fiio E6. Didn't now the level of your headphones when writing my comment. I think that ZX100 will be a good variant for you then, the only alternative for that price being ASTELL&KERN AK Jr. However, I've heard that it has some troubles with Windows 10 or MacOS so if you don't want to dance around it with tambourine, just buy ZX100.
I don't think that more powerful players like Colorfly C4 or ASTELL&KERN AK120 will give you a improvement in sound quality over ZX100 that is worth paying for, at least if you're not in the quiet room. I personally use Beyerdynamic T1 and (with proper amp) couldn't find any real differences between my iBasso DX100 and Colorful C4. So I wouldn't spend my money on something that I all the same would not be able to hear. But it's up to your own ears
BTW, I'm sure that a lot of people will call you "Crazy Audiophile" just looking at the price of your headphones