Well the best fans are going to be a Panaflo, Sunon, or If you can find it the Sanyo Denki San Ace, which is amazing.
You are looking for about a 80+ cfm fan, 120mm, and the 38mm deep fans are generally quieter for the same airflow vs the 25mm.
http://www.petrastechshop.com/120x38mmfans.html
Petras only has the good stuff, but good fans are not cheap. Almost all the fans on newegg and whatnot are much lower cfm than they say, and louder than they say and have some blinking lights or other BS on them.
You might want to look into if speedfan can controll your fan headers on your mobo. Im assuming you have enough headers on your mobo for all the 3 pin fans that came with the case? Pop open speedfan and see if you can throttle them down. With a little tweaking you can make speedfan ramp your fans up or down when stuff warms up and you can get away with louder (30’s and up dBA) fans and not have to listen to the constant noise.
Just STAY AWAY FROM THE DELTA TRI FINS, they are… LOUD.