I'm planning to get a G0 stepped q6600 and 8 GB ram for a computer where I'll run some virtual servers and play around with ramdisks. I have not yet decided if I should go with XP 64 bit or Vista.

I haven't seen any real reviews on how good or bad 8GB ram (4x2GB) is when it comes to overclocking and bandwidth. Will I be stuck with 333-350 FSB max if I go with 2 of the cheapest 2x2GB PC5x00 kit's I can find? (2 of [Kingston 2x2048 MB DDR2, PC5400 DDR2-667 - KVR667D2N5K2/4G] )
And are there any problems with lower bandwidth or other problems when using 8GB of ram?

The cheapest 8GB PC6400 I can find are 2 kits of [Corsair TWIN2X4096-6400C5DHX DHX 4096MB/4GB(2x2048MB) Kit DDR2 XMS2-6400 800MHz] which I suppose would be ok for at least a bit over 400 FSB, but the price of theese is more than 35% higher.

I suppose I am limited to memory I can buy in Swedish net stores, and not everything is available here. If you have any other kits to recommend I'll try to find them in Sweden. Links to reviews where 2 kits of 2x2048MB ram are tested and overclocked would be helpful!