An alternative thing to negotiate for are benefits. I found out after I got my last job, which I've had for 11 years now, that the other 2 guys that came in at the same time negotiated for 3 weeks of vacation/year instead of 2. I would have loved loved loved that extra week.
More vacation is something we get every 3 years or so, so I get the same # of weeks they do now, but it took me 4 years to get there!
What else, non $, is important to you? An extra good computer monitor? An extra powerful computer?...
Often, at least in my world, salaries even out after a few years, regardless of where you start.