We're living in Canada at the moment, but we lived in NJ a few years back and still have lots of friends there, so first hand advice a bit out of date but...things to think about....
Due to the fact you have no 'history' in the US certain things will be really expensive, car insurance for example, 12 x more expensive than the UK 'till you build up no claims. Leasing a car was quite tricky and you might need your DHs company to almost 'validate you' via a letter stating he's employed, his salary etc. Fuel is cheaper and actual cars are cheaper.
Cable, internet and telephone is double the price of UK.
Property tax (council tax equiv) is a lot, atleast 4 times as expensive, but a lot of this funding goes to schools hence schools are amazing in the right areas.
If you've got a heated pool that costs a lot to heat (almost died when my first gas bill over the summer was $1000 !!!!)
I hope to goodness your DHs job comes with comprehensive Health Cover for the entire family because to pay for it privately is off the scale expensive (literally thousands a month).
Eating out quite reasonable in the suburbs, we went for a fab breakfast in Ridgewood on Sunday and for 4 people paid $60 for more food than you could possibly eat (the general consensus in North America is if you don't take home a box of your leftover food then they haven't served you enough!). Obviously you can pay a lot, lot more for food in the city.
Does that all sound a bit negative, I hope not as it's an amazing experience. I think at one point North America was cheaper to live but I'm really not sure it is now, I was really suprised by how expensive Canada is. The most annoying thing for me was the thought of not being able to work as I couldn't get the right visa, just found that a really annoying.
Things I miss about the UK - familiarity, friends, family, M&S underwear and Ocado food delivery.