ill tell you this now, memory isnt everything. X3 is a very high graphic game that will require a better video card if you want SOME eye candy.. Also, the 6200 / 6600 arent very strong cards, The 6600 > 6200 Anyways, and i would go for at least a 6600GT / 6800LE because they are now bottomline the 'midrange' cards.
BTW, the 6200 can be Flashed to a 6600, but the 6600 Overclocked will definately be better than the 6200.
I'd go for the 6600 as the 6200 can't be modded any more. I'm not so sure that having 256megs of memory helps this king of GPUs as they can't process that much (as urern00b said). You could find a 6600DDR2 128Mb that performs a lot better for about the same price.
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