If I were you I would talk to a few mortgage professionals before you do anything.

First off the lending standards are VERY fluid and change according to market conditions. The standards in place today are markedly tighter then 2 years ago.

Second off, try to think about the future. Do you believe rates and standards will be higher and more strict 3 years from now, or lower and looser? Ask yourself that and answer honestly.

Third, go to a BofA or go online to Aim Loan and call them up. Pose as a buyer who has a rental property and wants to buy a home. See what the requirements are. Basically no matter what you say or show for your rental, the lender will have their own criteria. Many lenders will only give you income based on 75% occupancy no matter what you say or show.

So to be honest, my OPINION, is that having the rental property will more then likely not help your debt to income ratio. Just my opinion but you would be much better off talking to a mortgage professional.