Here is a link to Homes that are currently availible for rent in Ahwatukee.
It is difficult to tell you how much you can expect, without actually seeing the home, and what it and the neighborhood have to offer.
Atleast with this info you can get a "ballpark" figure.
Remember that your mortgage should not dictate your rental rate and has absolutely no correlation to what the unit can or should rent for.
You might want to get some feedback from a local property manager. You can find a resource for doing that below.
Many of the property managers we've interviewed lately tell us they are having to offer pretty strong incentives to procure tenants... there is just a lot of competition out there these days.
Hope this helps a bit.