[Watson]

to add, you should nego with your hiring manager or interviewer, most HR in a company are mostly administrative, they get the budget to hire from the directors, or hiring managers.

SO its up to the hiring manager to up 1k or 2k or XXX to your salary, the hiring manager will just tell HR to process and get the guy in. No questions ask. HR not very powerful to block you going in.

In any company, for a grade there is a salary ceiling, if the boss/hiring mgr is not too niao, he will likely grant your wish. Unless you are asking for the sky, then you may be rejected.
esle, hiring mgr will be able to get through to HR to pay what you ask for