P5WD2 Premium-cooling???

I am having some heat issues with my motherboard. I am curious to know how some of you are keeping your systems cool? What case do you have are you using water cooling? My CPU temps are OK but I cannot get enough airflow into my case. Lian-li PC 6070 Plus II.

Here is the system:

P5WD2 Premium
Pentium D830-Zalman CNPS9500 LED CPU Cooler
Powercolor Radeon X800GT
Corsair DDR2-667 2X512
Maxtor DiamondMax 10 6V300F0 300GB Serial ATA (3.0Gb/s) 7200RPM Hard Drive w/16MB Buffer
BenQ DVD+RW
Asus CDRW-DVD
Lian-Li PC6070 Plus II Case-Stock fans
Antec NeoPower 480
Maxtor DiamondMax 250GB SerialATA 7200rpm w/16m Buffer(Media Storage)
Samsung 215tw 21" widescreen monitor, Win-TV PVR500

I am not sure if I need to get another case or change the cooling system in the case? or am I just paranoid. Motherboard temps ramge from 39c-45c but it is usually around 41c-42c. CPU idle at 47c

Thanks for any suggestions!

 

Here is a link to the case:

http://lian-li.com/Product/Chassis/Middle_Tower/Classical_Silent/M_C_S_PC-6070plus_2.htm

I have taken one of the drive bay covers off but it did not make a difference. If I take both side panels off the temps will drop to 36c-38c but this invites alot of dust into the case and defeats the purpose of having a silent pc case.
The front fans pull air in from the bottom of the case.