Upgrading from d40 to d600. 1K lens Budget. Go!

Thank you both very much for the extremely helpful information.  Is there one central place to go online where you can see which lenses have incentives, etc.  I have seen in several other posts about discounts, etc.  Also, does Nikon have any special times for promotions (should I wait until November to pull the trigger, etc).

Again, thanks for all the help.