I have bought all the following components for my first time build and would like to know what you considered the best choice of 2Gb kit memory.
The component list is as follows:
E6400 CPU
ASUS P5W DH Deluxe
Sapphire X1950GT G/card
WD SataII 320Gb 16Mb HDD
NEC 7173 DVD

The memory I have been looking at is below but I am unsure which to opt for taking into consideration my computer use(CoH, Battlefield 2, Day of Defeat, Home entertainment, internet) and memory cost.
I presume the above spec is good enough to run the above games etc athigh quality, or near, without overclocking so OCing is not really on the cards and in any case my overclocking skill-set is not up to scratch yet(maybe in the future).

Memory choice:
Kingston 2GB 667MHz DDR2 Non-ECC CL5 (KVR667D2N5K2/2G)
Corsair 2GB 667Mhz DDR2 Non-ECC C4 (TWIN2X2048-5400C4)
Corsair 2GB 800Mhz DDR2 Non-ECC C5 (TWIN2X2048-6400)
Corsair 2GB 800Mhz DDR2 Non-ECC C4 (TWIN2X2048-6400C4)

So should I stick with the cheaper lower Hertz Kingston value set or go for something like the Corsair 800Mhz C4 memory? Your thinking would be much appreciated.

Your video card will be the largest determining factor in your gaming graphics quality. But, 2gb of memory will help in smoothness and overall system performance. Any of the memory you listed sounds great. If you don't intend to OC there is no real need to buy any memory faster than DDR533. However, this memory often costs about the same as DDR800. I would personally suggest a PC6400 kit (DDR800) as it will typically be made with a better IC than a comparable DDR533 kit. You will then be able to run good latencies at slower speeds and also scale up well in speed.

Check out this article for some test results at different latency timings and memory speeds: http://www.madshrimps.be/?action=g [...] rticID=472

Cheers all for the help and that link was very interesting.

Just to add to this, I've been skimming the net again and have been looking at the OCZ models. Came upon 2Gb pc2-6400 Gold Rev.2 in Cas4 so I was wondering if you had any opinions on this model and how it compares to the others.
Cheers.
p.s. I presume everyone would recommend the 6400(800mhz)Cas4 over the 5400(667mhz)Cas 4 model?

OCZ 6400 compared to which 5400? OCZ's modules are so highly overclocked you often can't do much more with them. You could probably get some other brand of 5400 CAS4 to run at CAS3.

Anyway, will you be overclocking?

If you really want 6400, PDP Patriot is cheaper, clocks higher, runs at better timings.

Not just yet but quite possibly in the not too distant future.