That's good input, external disks or a NAS might actually make sense here to widen my options (two spinning disk bays seem to be the norm in cases these days, so I had to look around). Though I'll have to check what it does to the price. And I don't want to plug things in and out all the time, so I would need to be something that does standby on it's own rather well.
As for the PSU, that's true as well. I'm really not certain about it, so I went a little overboard I think. I do want to drop in upgrade the 2080 to a newer card eventually (whatever follows 40xx or the AMD equivalent), but not now. I'll definitely look into that again.
Sound: Quiet is nice, hence the case with some insulation and a door to open for heavy workloads. Though I don't need it completely quiet, usually I have headphones on with music/background twitch/whatever even when programming. And I've never did liquid cooling, so I kept my distance. Could be a mistake, not sure.
Periphery is not a consideration, I'm happy with the stuff I have right now. Leopold FC900R black keyboard with MX blues, and some razer mouse whichs name I forgot. Bought it after Logitech spammed me with too many irritating, unskippable twitch ads, and to be honest I'm positively surprised. I didn't think highly of razer before that, had Logitech stuff for as long as I remember. But it's neat except for the nag software, though that's a non-issue on Linux.