Have you considered using an AIO liquid cooler? Plenty of people have 240mm units in their M1, it seems to do the trick quite well. I don't see why you wouldn't be able to use one with that setup, unless you're using the drive cage on the side, but even then, a 120mm rad is still possible. And if you prefer air cooling, the Noctua NH-C14 appears to be the biggest cooler that will fit into your configuration. I personally use a Noctua NH-U9S, and my delidded 4670k at stock tops out at around 56ºC in Prime95.
I was considering a Corsair H110i GT but i'm afraid of the tube bending since its a compact space.
I was more inclined to buy the Noctua NH-C14 but I can't be sure it fits. Does it have to be turning a certain direction?