What are you going to use it for?
That laptop only supports Centrino, not the dual core models. Add to that the fact that it only has a GeForce 6800 which at this points is 2 generations behind.
If you are set on that laptop you also need:
wireless(like you said)
If you want to game you may want something better than the 6800. For the most part, building your own laptop doesn't save you as much money as building a desktop. I would recommend that you just buy a pre-built laptop.