I have taken jobs as far away as 3000 miles from where I was working at the time. Unless I had visited the place previously, I invested in a trip to discover what the reality of the place was and to negotiate terms in person. Once, I found that it was in a town that my wife and I would not have enjoyed living in or near. It was worth the few hundred dollars I invested in travel. Travel was always a one day thing - no overnights. For the far away offer, I took a red-eye out and a late evening flight home. I always found the most inexpensive flights to keep the cost down.
Negotiating by email is not the best idea - for you or the employer unless you already know the place and its environs. Sometimes, there are subtle issues that you can't figure in to your requests that you see clearly when you get there. For instance, if the place of employment provides many extras - think Google - you may not want to spend so much time away from the place of business.
Remember, you are talking about at least two years of your life and hopefully much more.







