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#11
Your system has a 32 bit windows, so if you don't plan to upgrade it makes no sense to buy 6gb since 32bit systems can only use up 4gb at most.
So 2x2 gb would be a good choice. I would choose the 800 mhz modules, there is not much of a difference. Just make sure that the ram you buy is DDR2 (which your motherboard works with)