What do i do? I got a job offer that doubles my current salary.?

I just got a job offer to move back to my home town in CO. to be a superintendent for a construction company that builds condos. I currently live in AZ. and work as a foreman at a roofing company. The offer they made me was 90k a year to go to CO I currently make 52k in Phoenix. Both my kids and my wife want to go. However I owe 252,000 on my house and its not worth much more. Also the housing market has takin a big drop in the last few months with many still on the market since Feb. 06. So do I bail on the house and move back to Co. or stick it out with the company that I am at and hope I can get to 90k in the next few years? PLEASE HELP!!!