Gotta love how PP tries saving you money, he's good at it.
I didn't get an i7 and 16gb of ram that wasn't needed probably cos of him.
I got over benchmarks, got rid of my fps counter and just started gaming and now I'm enjoying it without worrying about FPS and stuff.
And from what I remember about airflow, intake is from the side and front, exhaust from the top and back.
Your case, mobo and cpu are fine, just switch the gpu like PP suggested and spend the extra money on getting a nice L Shape desk or build one like suggested earlier.
I love my L Shape glass desk, so glad I went with that setup
Awesome looking pc btw, looks nice and clean, good job!