A well written post, I just given this onto a student who was doing a little analysis on that. And he in fact bought me lunch because I found it for him.... smile. So let me reword that: Thnkx for the treat! But yeah Thnx for spending the time to talk about this, I feel strongly about it and enjoy reading more on this topic. If possible, as you gain expertise, would you mind updating your blog with more information? It is very helpful for me. Big thumb up for this post!