I'll think about the GPU later. For now, I need to decide which monitor is the best.
You said "Another option, is to figure out a way to have 2x monitor of different sizes, but look the same with your setup. So the width of the portrait monitor, matches the height of the landscape monitor."
That's my question ! xD I can't really decide which monitor suits which monitor. I needed help with that.
And yes, I'll consider U2412M as well :)