Anyone want to throw out rates for SEO work?

I usually bundle it into a design package, but I do have three levels.

1. Consultation - I look at a site and say what is wrong for X
2. SEO Work - I SEO a page normally when designing a site for (5 to 10X's X which is Y)
3. SEO Guarantee - I guarantee top 50 position for Z (10x's y)

How are you billing out your SEO work?