If your base cabinet is wide enough, I would get a 31" or 32" undermount single bowl stainless steel sink such as the one below. From a good granite installer they should cost between $300 to $350, if not you could go to Lowe's or Home Depot and find them there. In fact, go to one of those stores and see in person the various configurations. As RickD stated above, a divided sink is really useless and when you have big pans to clean you'll be thankful you chose the larger.
I don't have a better picture, but here is a kitchen we had remodeled in Baltimore. On the far left of the photo below the window is a 31" sink. With a nice sprayer it goods great. The granite still has rounded corners even thought the sink is squarish.