
OMG, you didn't mention this the other night! You absolutely cannot go!
Seriously, what an amazing opportunity. I think in your place I'd be tempted to apply. As others have said, it would give you more time to think about it and discuss it with the family. If you get an interview, you don't have to go. If you get the job, you can turn it down. But if you don't apply, you'll never know.
Would your current boss know that you've applied though? Could it jeopardise your chances of getting something decent here if you decide it's not for you afterall?
How often does this sort of job come up? Maybe you could leave it a few years?