Um the case i just got in the mail is the Cooler Master Elite 431 and i just came with one fan in the front of the case to suck air in. thats it. is that good enuf for like a 750$ gaming build like do i need to buy another fan for that back or will my power supply cover me on getting the hot air out.
Seconding Notarget on the exhaust fan, doesn't need to be anything special but having a fan pushing air in and one pulling air out certainly makes the airflow more streamlined and will keep components cooler.
Also most PSUs don't run their fan on full speed, some even shut it down if they aren't needed to cool the PSU itself. So you shouldn't rely on anthing when it comes to PSU+airflow.