I really love negotiating. I also like knowing the budget a position has been assigned. Obviously salary means you're getting paid less than the value you con

I really love negotiating. I also like knowing the budget a position has been assigned. Obviously salary means you're getting paid less than the value you contribute so then it becomes a matter of squeezing more value out of the position or adding more value than advertised? I've interviewed candidates. They come in every skill set. Some under value themselves while others. We've been given a max budget of $150k. What do you do when an amazing candidate who could replace a dozen current employees only wants $180k?