Need front fan if have side panel fan?

[Slam]

Just got a Fractal Design R3. I'm running cpu/memory/gpu at stock speeds and am happy with temps. However, I'm about to install a 2nd GTX 460 and will overclock.

My question is, do I need a front case fan if I have a side panel fan for intake and one rear plus one top fan for exhaust?

The drives are 2x Western Digital blue and an SSD. Is the front case fan basically just cooling these drives?

CPU is SBridge 2600k, GPUs are GTX460s in SLI.

 

[Tealc]

Even a slow moving fan up front can drop the HDD temperatures quite considerably but any front to back airflow you create with the front fan will be messed up by the side fan anyway. If the WD Blues are running hot then it might be worth having a slow one up front.

 

[Slam]

So basically a slow quiet fan at front for hdds and on side panel for GFX cards. Both don't need to push much air as they're right by the components they'll cool.

Then fans on top and rear to shift more air so that hot air exhausted as fast as possible.