Best Answer unselected, I didn't mean to pick a Best Answer. I was banging my mouse off the desk because it gets clogged up with dust, cat hair, etc and I was trying to shake it out, and somehow I clicked on "Pick as the solution." My bad.
Anyways, you have made a decision on a power supply (hopefully), and you have airflow in your case. That's all you need, you're ready for your GTX 950!