I know you chose another case (for now, at least), but I have an Obsidian 750D:
It can accommodate 3x120mm or 3x140mm top fans, 2x120mm or 2x140mm front fans, 1x120mm or 1x140mm rear fan, and 2x120mm bottom fans, up to 420x140mm top rad (<85mm/3.3" total internal thickness for fans+rad), up to 280x140mm front rad (any thickness, assuming you move the drive cages away from front), another 240x120mm bottom rad (with no drive cages), CPU cooler up to 170mm/6.7" tall. Full ATX/EATX mobo and PSU form factors, nine card slots, and GPU card lengths up to 275mm/10.7" or 360mm/14.2" or 450mm/17.7" (with middle, front, or no drive cages). The mobo tray is not removable, but it has over 25mm/1" of underside clearance, and it has a large cutout for oversized CPU coolers. There is plenty of room for lots of everything, including heavy cooling. It has great airflow, comparable to a HAF, at least when the front panel door is opened - but you need to add fans because the Corsair stock pieces are pretty weak.
Note that online specs for the 750D appear a little obsolete; my unit is obviously a newer revision with proper mobo standoffs, added fan-mounting capacities, and a few extra convenience features. But it requires a little case modding to become perfect, it has a few minor design flaws and disappointing wiring problems out of the box.
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