The best leverage you have during negotiation is to negotiate when you don't really need the job. Don't wait to be out of a job before interviewing. If you can do this, most of the advise in this article is immaterial. Have a number in mind that will make you happy and make you switch. Give out the number. If they can do it, you take it else you stay in your current job. That cuts out all the bullshit mind games described in this verbose article.