First I would not even bother with an AMD chipset for an Intel CPU, PERIOD.
Huh? I didn't realize AMD made chipsets for Intel CPUs. He was looking at getting an Nvidia chipset, I think you meant that.
Right now the best bang for buck chipset is the P35. With to me the DFI BloodIron motherboard and Intel Q6600 for a quad setup, with a good 8800GT video card.
This next bit is all over the place. The P35 is a great motherboard, and does provide a very nice band for your buck. But the Q6600 does not. The Q6600 is $200, while other faster dual core CPUs are less. The 6850 for example is 600MHz faster, and is $15 less. If you don't mind overclocking, the 7200 is a very popular choice. It starts higher then the Q6600, and is a mere $130. Yes you are giving up two CPU cores, but that doesn't matter much for gaming.
The other bit, as already mentioned, is the 8800GT. If you are going with an P35 CF board, you are better off with a 3870. Should perform very similar to the 8800GT. I personally would get the 8800GTS 512MB, as that seems to be the lowest card you should get for a new rig. You should be able to find one for $150, a great price for a great card. If you can, the 4850 is a better deal, but not everyone wants to spend so much for a card.
Go with DDR2 at this time ... you can't find much difference between DDR2 and DDR4 performance compared to the price.
DDR4? Uhhhh, yeah.
get ddr2 800 and oc them
period
I would not overclock the ram. Set the ratio to 1:1, and put the FSB at 400MHz. This runs the ram at DDR2-800, which is not overclocked. Adjust the multiplier as needed to get the system stable.