RUN!! Just kidding
I was born in Hackensack Medical Center in Bergen County NJ. I lived in Bergen County my whole life. (Until I moved to NH a couple of years ago)
This is my take: Bergen is cool, easy access to NYC, overall very good schools, low crime rate (the whole county) some very upscale neighborhoods, and moderate income levels as well. But as others have said, it is expensive, silly expensive. If you end up in North Jersey you will be in the wealthiest 50 mile circle in the world.
On a map, if you take and draw a circle, with the middle being northern Manhattan, you will be in terms of house hold income per capita, the RICHEST area in the world!
This is great and horrible. You have the best of almost everything, from medicine to fine dinning, the major draw back, you will pay for it.
South Jersey, say Bricktown, or Ocean county used to be a great alterative, however it to has become very expensive. The bottom line, IMO as long as your income is strong, you will have a lot of nice options, but if your household is very budgeted, it can be very hard to just make ends meets. Some of the major costs that might surprise you are real estate in every way, auto insurance, property taxes, state income tax, sales tax, health insurance, traffic fines, etc.
You can find a nice spot to settle down for a couple of years, but depending where you are from the combined increase in living expenses may be a surprise.
Half of the reason I moved was I wanted more discretionary income available for family fun, savings, and toys.
Good Luck,
Robert