value of traffic

Hi I use similarweb to get an idea of number of visitors of a website; I also use alexa but as a free user it wont give an estimate of the number of visitors (just overall ranking). However, now I am looking for a good website that gives a reliable estimate of number of visitors AND...

I was just going through a pretty good whitepaper on the value of SEO that goes through some interesting calculations on value of a ranking and CTR. In one of the charts they talk about the calculating the net present value of a page 1 ranking based on exact search volume and lo0ng tail...