Adding more square footage to a home is always a more effective way to modify an existing structure.  Rather than buying a new home, simply make the current home into your hearts desire by adding onto what you have.

Or focus on the kitchen and bath for an interior face lift.  Home values skyrocket when a new bath or kitchen is added.  Re-selling a home or buying property to 'flip it' can maximize profits when simple interior upgrades are added.  It's always the best way to get the biggest bang for the buck.