I agree with others before me who have advised that buying and then selling in three years is very risky. I think you should sit down with a trusted lender and figure out your costs to buy, and then do the same thing with rent. Then do some more equations with what it cost you to sell the property down the road, including commissions, tax stamps (divide the sales price by $500), attorney fees and other closing costs. It would be very difficult to recoup your costs in just three years, unless the market experienced a big upswing, which few are predicting now.
Providence Plantation is a GREAT neighborhood, and even though values have dropped, it still is a very desirable neighborhood because of the quality homes, fantastic schools and convenient location.
If you are SURE that you will be moving in three years, I would probably advise you to rent, unless you found a spectacular deal, maybe a fixer upper that you improve with sweat equity.
Thanks for posing the question, and please call me at 704-654-9700 if you have more specific questions, or just want to discuss your options in more detail. Good luck!!!