Love your setup. Love love love.Love it. What interface are you using for the LG ultra-wide? HDMI or did you have to rig a USB-C to mDP connection?
Very seriously thinking about duplicating it!
Most of my storage needs are networked - either local or cloud-based, so a big desktop computer or a laptop with multiple ports isn't really necessary for me any more. And almost any computer made in the last few years is fast enough for what I need, save for the occasional bluray handbrake rip for which I can keep my quad core 3.5GHz iMac tucked in a corner for; it runs my home iTunes/AppleTV server and a few other home automation things, so I can't completely get rid of it, but it can certainly be hidden away.
As soon as the 1.2GHz/512GB models hit the local Apple store stock, I'm pulling the trigger.