Just read those articles in guru3d, tomshardware and anandtech.. that would suffice..
Get from allngap bro, he's selling it

Wahlau, check with allngap sales thread n got sooo many choices ah, donno which to choose ah..
NMBNMB low speed 80mm
Model : 3110KL - 04W - B19
Dimension : 80*80*25
Speed : 2150 rpm
Airflow : 24.5 cfm
Noise level : 22 dBa
Current rating : 0.1 A
Power consumption : 1.2 W
Link :
http://www.nmbtc.com/index_f.html* RPM is supported
* suitable for dead silent setup and for case cooling
* not suitable for CPU cooling.
RM 15
Delta medium speed 80mm
Model : AFB0812VH
Dimension : 80*80*25
Speed : 3600 rpm
Airflow : 42 cfm
Noise level : 38 dBa
Current rating : 0.26 A
Power consumption : 3.12 W
Link :
http://www.delta.com.tw/product/cp/dcfans/dcfans_main.asp* RPM is supported
* suitable for all case cooling but not for dead silent setup
RM 15
Panaflomodel - FBA08A12L
dimension : 80*80*25mm
speed : 1900rpm
airflow : 24cfm
noise level : 21dB
current rating - 0.1A
power consumption : 1.2W
. Made in Japan
. Suitable for dead silent setup
. Quantities - A lot !!!!
Price : RM 10 per unit
model - FBA08A12M
dimension : 80*80*25mm
speed : 2450rpm
airflow : 32.1cfm
noise level : 28dB
current rating - 0.17A
power consumption : 2.04W
. "2 units are Made in Japan" + "3 units Made from China"
. Suitable for dead silent setup
Price : RM 20 per unit
model - FBA08A12U
dimension : 80*80*25mm
speed : 2950rpm
airflow : 39.6cfm
noise level : 32dB
current rating - 0.25A
power consumption : 3W
. 3 units "Made in Japan"
. Not suitable for dead silent setup
. Pushes sufficient amount of air yet silent
Price : RM 20 per unit
model - FBA08A12M
dimension : 80*80*25mm
speed : 3450rpm
airflow : 46.9cfm
noise level : 38dB
current rating - 0.36A
power consumption : 4.32W
. 1 unit "Made in Japan" + 2 units "Made in China"
. Not suitable for dead silent setup
. Pushes a lot of air
Price : RM 20 per unit