Building an overclockable Conroe gaming rig

This is another "help me with my build" thread. But I really need your advice.

I'm going to overclock it as much as possible within reasonable limits on air.

This is what I'm getting:


Intel Core 2 Duo E6300 (Don't need more than that especially because I'm going to overclock it)

Asus P5W DH Deluxe (Best overclocking mobo acording to Anandtech )

Tuniq Tower 120 Ultra Silent CPU Cooler (Do I need it for OCing such a "cool" cpu?)

Corsair Value S. PC5300 DDR2 2048MB Kit (Good for 800MHz @ 4-3-3-8 acording to Anandtech)

PowerColor Radeon X1900XT 512MB (Cheapest X1900XT here in Sweden)

Zalman VF900-CU-LED (Do I need it?)

Maxtor DiamondMax 10 200GB SATA 8MB 7200RPM (Already have it)

Another Maxtor DiamondMax 10 200GB SATA 8MB 7200RPM (For Raid 0)
or
Seagate Barracuda 7200.10 320GB NCQ 7200rpm SATA II 16MB (For more space)


I'm going to be gaming @ 1440x900 on my sweet 19" Widescreen.

These are my main questions:

Is the X1900XT overkill?

Will the stock cooler be enough for my the cool little Allandale?

Raid 0 really with it? Or am I better off with more hard disk space?

Thanks and if anybody has a Conroe/Allandale please post your overclocking experiences, including temps.

Whats wrong with it?
Its good for 800MHz @ 4-3-3-8
Isn't that enough?
Did you not see the link I posted about the ram?