I think the max CFM your going to get out of a 120mm is from this one
http://www.newegg.com/Product/Product.aspx?Item=N82E16835706023
RPM: 6000 RPMAir Flow: 210.38 CFMNoise Level: 64 dBAThe DBA level is a little steep though and for 36 bucks you could spend a bit more and get this...