512GB not enough? buy thunderbolt dock and larger SSD
Don't know why you need 4K editing (most client side has no 4K TV and computing power for 4K playback)
You have to bear very high cost for 4K editing
it's not about the purpose of your videos
your budget will not meet your required standard of quality
TIME, BUDGET, QUALITY
you can pick only 2 and suffered from the other 1.