1750 is the best all around option.
They are just so large.
I want to transport the gun separated into upper and lower to fit it into a small case that looks more like a general purpose equipment box rather than a firearm.
What AF said. Any hard case flat and rectangular is going to look like a rifle case. You could go with the cube shaped Pelican/Storm, but that would be a lot of wasted space and a pain to move around.
How about a guitar case?