I think this career is in great demand but that should give you the confidence to find the right pick. You should assess if that is a job that would fit well with your lifestyle (proximity, culture of the teachers, parent involvement-whatever is most important to you). If it doesn't feel right, then go with your gut. There is always a job out there and the right one will find you, just let the principal know that you are flattered and would absolutely consider it. The principal will understand that you need to take time to make such a huge decision because you want to make the right one.

There is always jobs out there to teach and if you pick a bad one then that does become the school you teach at for a bit. Give some time and thought into where you would like to teach as that will be your place of teaching for that year at the very least. Considering other options before jumping on the first opportunity would be my call personally.

Always seek your options out so you find a school that fit your needs best but also, if this school accomplishes that, I don't see anything wrong with committing to it.