I would go with Samsung. From what I have read, it is considered, by most, to be to be the best RDRAM you can buy. Even better, buy the retail boxed CPU that includes RDRAM. You will get a MUCH better warranty, and it will cover your memory also. I think Intel puts Samsung memory with most of thier retail P4's, but I wouldn't swear to it. Hope that helps!
There are two theories to arguing with women........neither of which work.