DDR or Rambus 4200

I am planning a upgrade this month to a p4 2.53. I have been trying to figure which way I wanna go with the memory. Here are the boards I have selected Asus P4T533 for Rambus or Soyo P4 400 Dragon Ultra. I have heard and read where rambus is faster than ddr. Most of my friends run ddr. My uncle (CiKoTiC) is running ddr with his xp 2200 and it is fast. While I'm at it should I get the msi 4600 or the Asusv8460 ultra 4600 for the vid card.

I really appreciated all the info you guys can give me