Wow! Talk about the camera coming well equipped...... On the wide side I'd probably go with a 12mm to 24mm. I'm using a Sigma 18mm to35mm on the wide side. Ialso have a Nikkor 50mm f/1.8 and 35mm to 70mm both from film Nikons. My everyday lens is a Sigma 28mm to105mm zoom. My long lens is a Sigma 70mm to 300mm zoom. I already have the D7k battery grip...Nikon also. B&H Photo has the best price I've found so far. They also sell anknock-off Bower unit but it may void your Nikon warranty.
Good shooting.
Chas
Good shooting.
Chas