So, I don't know why you don't just move your current rig to the place in your drawing. The perspective change would do you good and you wouldn't be staring into a corner when you have that great behind you. The near-field with the HR stands will not be a big deal as that space isn't used anyway. The poster should move to the wall the the right of its current window location no matter how many total windows you have. Alternatively, put it on the wall the the right of where your rig is now.
Might as well try it in that location and see if you like it. I sit perpendicular to the windows with an amazing view of SF Bay and I have my rig on my desk with the wires hanging off, etc. Who cares, that space on the other side of my desk is unoccupied because me guest chairs are to the left of my desk facing out the window. Just my 2 cents, but buying new gear seems unnecessary you gear whore.