I don't post alot on the forum, but I have been reading it for quite a while... and I think I can make a pretty good guess on what is going to be the reply to this.
1) "It all depends on the kind of applications you are using the system for. Are you going to use it for gaming, graphic design, video editing, etc...
2) Go with the AMD64 3000+
That's what I think most of the replies will be just from what I have seen. But I am definitely not the right guy to ask. I am currently trying to make my own first computer, and don't really have a good idea of what to include yet.