I would get the i7 and the 500GB flash storage (SSD), but that puts it at $2000
For that price you could do better with a PC.
MACs are nice, they work well, but compared to a PC...you will go broke with a MAC.
Yes, I understand what you are saying about the 4K screen.
Still think you would do better with a PC.
Like this...or similar...set PcPartpicker to UK. Due to brexit..things are cheap there atm.
https://uk.pcpartpicker.com/list/CwsbZ8