Never be the first to give a number. Then you have lost the negotiation. An option is to go with something along the lines "I have a number in mind that would

Never be the first to give a number. Then you have lost the negotiation. An option is to go with something along the lines "I have a number in mind that would satisfy, but as I'm sure you have looked at the market rates I trust you'll make a great offer if in the end you are interested"