DEFINITELY go for it. This job market is too tough to turn down any opportunity. You don't have to live in the same place where you have your first teaching job forever. With my husband and I, I got offered the good career job first, so we moved for my job. (Only about an hour away, but it's something.) Who knows if we'll be here forever, but I don't regret this decision for one second, and neither does he!
Also, it's first grade, which is my personal favorite - no way would I recommend turning that opportunity down!