Changing a Brick Home to a Stone-Sided Home?

My wife and I are thinking about purchasing a brand new brick home that is listed at about 30% below market value. The problem is that we really prefer the look of stone. What is the best (read: highest quality) way to change a brick home to a stone-sided home, if this type of thing is even possible? I would greatly appreciate any advice, including any information regarding potential costs associated with this type of project in Northern Virginia, to a home with approximately 4000 sf of finished interior, above grade space (2 floors not including attic space) 

Thank you very much