Well, the cost of living depends where you live. Jacksonville is incorporated, and includes all of Duval County. Traffic is terrible, because of people living in the Jacksonville area, and living out in the suburbs. Some people like it, I moved to the country after living in Jacksonville for 12 years, and was happy until more and more moved out of town and the country started getting crowded. Now they are building a new internet around the out side of the one they have now, to move more people out to the neighboring counties instead of through the city part of Jacksonville. There is also a north and south interstate that runs thru the area. If there is an accident, the interstates usually get shut down for a while.
But, the cost of living is reasonable, due to some of the same reasons I stated above, they are building many new and high priced subdivisions that come with restrictions as to how you can live and conduct yourself. You can not park in your driveway, or leave your garage door open for extended periods of time. You can't park a boat in you yard or have a TV antenna on your roof. You can't leave your garden hose streatched out across your lawn unless you are watering your grass, and you can only do that twice a week. It really isn't as bad as it sounds, there are many farming communities close in, and the homes are more reasonably priced, with less restrictions. Jacksonville was, not to long age, a small town that wanted to be bigger, and it is still working on it. They have a pro football team, they are trying to get stores and such to move back into downtown after running them out of town to the malls.
The people are pretty nice, and weather is usually great, I ride all year around. I'm kind of outdoorsy and guess that is the main reason I'm still here. If I could afford it, I would move down to the middle of the state where the weather is even better year round, and there is much more to do since all of the theme parks are down that way, and the fishing is better.
Google Jacksonville and the surrounding area, you will probably get more and better information, mine is a bit tainted as they are moving the city out to me. The new interstate will be within three miles of my 2 acres, and the area is already growing. Good luck, do you know where you will be working, what area I mean? I might be able to give you a little better info that way. PM me and I'll give you my e-mail address.
David