First of all thanks!1) For this config you do not need a case fan. But I would setup them push out.
2) The default fan on the BlackRidge is not very silent, so better use a Noctua A9x14. http://glob3trotters.com/portfolio/alpenfohn-black-ridge-best-low-profile-air-cooler/ For the best noise and temp scenario I would use an Noctua L9a with 3D printed fan duct.
1) Isn't always better to have fans / shouldn't always lower temps? by "push out" you mean exhaust?
2) You're suggesting to go with L9a with fan duct? Is it better than black ridge?
I'm more interested about temps instead of noise.
Thanks in advance.