Are you asking about paying off your house early. If so, I just wrote a hub on this topic. My advice is that you do not aggressively pay down your mortgage faster than you need to, especially if you purchase a home in this market with interest rates so low. Not to mention the possible tax savings you may get if you itemize deductions. And I would definitely get a 30 year mortgage not a 15 year, again, with interest rates so low, why be in such a hurry to pay it off.
I would pay off any other debt before making additional principal payments on your mortgage. If you have no other debt, then I would put any extra cash into either a high yield savings account (admittedly hard to find these days, but interest rates will come back up, guaranteed) or some other liquid asset or diversified marketable securities. In other words, save your money for a rainy day. That way if you lose your job, you can continue to make mortgage payments. Generally, you won't score any points with a lender by making advance payments on your mortgage. If you lose your job and discontinue payments, they'll still foreclose. And then you've lost all that additional equity you put into your house.