... my advice is keep the home.. as far as a long term investment.. I would be surprised to find one that is better...
If you are worried about the market.. lock your interest rate on your home.. and be prepared to sit on it for awhile if in fact the market drops off.. it should only be a matter of years before it turns around again.. I happen to work in the mortgage industry btw.. in case you were wondering what good my advice may be.