Sometimes holding out at the dealer can work for you and should never work against you. When the sales guy keeps calling you and knows he's got one he needs to close, that is when you negotiate upgrades. Most the time they will give you a break on labor. Good luck with that..... Always get a young salesman, they don't normally have a mortgage.
by the way, until you take delivery your not obligated to honor the contract. You can still negotiate (upgrades), don't let them tell you otherwise.