Case Fan Selection w/ 1st time build

[Rags]

If I am reading my MB specs right, my case fan can be controlled by the MB temp. What I can't seem to find is what type of fan to use. Does the MB actually need a speed sensor in the case fan (The bio seem to indicate it can report temp & fan speed.

System:

ASRock 939SLI32-eSATA2 Socket 939 ULi M1697 ATX AMD Motherboard - Retail
AMD Athlon 64 3000+ Venice 2000MHz HT Socket 939 Processor - Retail
OCZ 2GB (2 x 1GB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Dual Channel Platinum System Memory Model OCZ4002048ELDCPE-K - Retail
eVGA 256-P2-N437-LX Geforce 7300GS 256MB GDDR2 PCI Express x16 Video Card - Retail
Seagate Barracuda 7200.9 ST3250824AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

Ever Case E4252BB-53 Black Steel ATX Mid Tower Computer Case - Retail
SeaSonic S12-500 ATX12V 500W Power Supply - Retail

Microsoft Windows XP Home With SP2 - OEM

NEC 16X DVD±R DVD Burner Black IDE/ATAPI Model ND-3550A - OEM
SONY Black 1.44MB 3.5" Internal Floppy Drive Windows 98SE/ ME/ 2000/ XP - OEM
LINKSKEY LKA-CR15B 19-in-1 USB 2.0 Black Card Reader/Writer - Retail

DELL - UltraSharp 1907FP 19-inch Flat Panel LCD Monitor

After figuring out most of the system I seem stumped on a $5-$10 part. I haven't found details on fan selection on any of several forums. This is my first build so I would appreciate any suggestions for a 120mm, preferably a quiet one.

Rags

[flanzig1]

Many motherboards do read and control a case fan. You need a 3 wire fan(2 for power and 1 for RPM). Most people don't plug case fans into the mobo due to the low current that a mobo provides for fans(the CPU fan does need to plug into the mobo.