OK...next question:
I want to fit 4 fans...the 3 stock fans and an extra 120mm fan in the 'centre' position, blowing in over the graphics card.
As you know the fans all have molex connections.
What are the options for connecting the fans to the mobo? Do I need to buy any 'extra' cabling/adapters?...or is it better to keep them running all the time under their respective High, Medium, Low control settings?
Not sure of the best option here...
Apologies if you've already looked into this, but are you sure you need 4 case fans? The main reason to buy a P182 is for low noise and adding lots of case fans seems to defeat the object.
I've been experimenting on my system and I've been surprised how little I've needed. I've been putting the max load on the system by simultaneously running Orthos blend AND 3DMark06 AND copying several GB of data, for 30 mins. I've ended up needing just the top/rear fan running (replaced with a Nexus, which has about the same airflow as the Antec one on the low setting). The top/top fan is disconnected and the vent blocked (it didn't make things any cooler), and the bottom fan has been removed. The PSU fan is running at slow speed (I can't hear it). I have no fan in the middle, and the divider to the bottom compartment is closed. No mods to the case.
Max CPU core temp is 54 C
Max graphics card core temp is 72 C
Max ambient (inside case) temp is 38 C
Max HDD temp is 38 C
My system is not the same as yours (spec below) but, given that my temps are pretty good, I'd be surprised if you really needed 4 case fans.
My system:
Intel C2D 8400 running at 3.44 GHZ, Arctic Cooler Freezer Pro 7
Gigabyte P35 MB with 2GB OCZ RAM at 1075 MHz
Gigabyte 8800 GT (the one with a Zalman HS/F) at 760/1900/1960 with fan under-volted to 7V (GPU temps are 3-4 C lower with the fan at full speed, but that's too noisy!)
Corsair VX450 PSU
WD 500GB HDD