Since the LG 5K is allegedly pretty buggy & the jury's still out on how many of the problems will be fixed by the upgraded shielding / software updates, the LG 4K is too small, most of the USB-C monitors I've seen don't have any sort of hub facility and there aren't any Thunderbolt 3 docks out yet I'm thinking of buying a second hand Thunderbolt Display (there seem to be quite a few good examples around ATM). Pros:
- Has speakers and FaceTime camera
- Has Ethernet
- Easy to connect with thunderbolt 3 to 2 adapter
- Good display quality
- Great build quality
- Not been beaten with the ugly stick
- "Only" 1440p / sRGB, not 4/5K and P3 colour
- USB 2
- Can't charge MBP as no MagSafe - USB C adapters exist
- No warranty (unless I find one with AppleCare that the previous owner will transfer for me)