Osuche my heart goes out to you. I know it's hard but I think Ginger's right. Most companies recruit heavily and don't consider the cost anything more than a write off. Being professional about it would tend to be looking at them without reservation and saying "Well guys, I've had a better offer." It's really not their business what the offer is. I'm sure you'll handle it though. You're pretty straight up from what I read. Think of it this way. If they handle this badly they won't have a chance to recruit you if they find another opening down the road. They're the ones who should handle this professionally.

__________________
As to marriage or celibacy, let a man take which course he will. He will be sure to repent - Socrates

Love is not looking in each other's eyes, but looking together in the same direction - Antoine De Saint-Exupery