[tsotha]

I agree with this wholeheartedly. And anyway it's not necessary. First you get the offer. Then you go to your boss and say "Look, I'm not really happy with my current situation. The market supports a larger salary than you're paying me."

That's a threat, sort of. But it's veiled enough that your boss can give you a raise without feeling like you forced his hand. He can give you a raise without it being step one in a two step plan to get rid of you.

If he doesn't... well, then you take the other offer.