Asus TUF 1660Super, was able to get one used for cheap. The fan shroud was 1-1,5mm too thick, but by removing the thick plastic backplate, i was able to bend the GPU inwards a little bit. Yes the sidepanel is touching the GPU fan shroud, but it doesn't block the Fans.
As for the Mainboard. The Backplate height was greater then the standoffs, and thus bending the metal tray, when screwed into. With it bend it was impossible to screw the tray into the Case. Sidepanel wouldn't be a Problem...well my RAM is a little higher then the Noctua L9i Cooler and is touching the Sidepanel, but it closes and doesn't bend. I could remove the RAM Heatsink, but since it fits (barely) I leave it like that.
I also made sure no Metal is touching either the Case or contacts on the Boards. For the RAM and GPU shroud touching the sidepanels, they are plastic.
I'm only missing one thing...2 pairs of rubber feet for the Case.
@Mashndrow Must be a Problem with Chrome. In Firefox it never gets over 5% Load...with a UV'ed 5950X...