Best Air cooler for mATX?

My mobo is a Gigabyte g1 sniper m5 mATX board, and my case is a Corsair 350d.

I'm currently using a h100i for cooling my 4770k, but really it's getting old. It's loud, and quite frankly i'm afraid of it leaking.

What's the best air cooler I can get for this size of board and case? I'd love to get noctua, but I don't think it'll fit my board. I've looked at the mm clearance of my case, and the nh_14 says it's too big, but i'm seeing online people using them with my case..

can anyone help please?