Hold out for at least 2.5 and show what compromise is. What a worthless army he has.
At a minimum, I want $1B to show that Congress has funded significant money for the Wall. Take away their moral figleaf that the Wall is immoral. Make them pay $1B so that they are on record that this is legitimate use of money in their eyes.
And then use Army money and build a great big Wall exactly as the president wants.