I was going to replace my SB-600 with the SB-700, so the SB-700 is my recommendation. I always liked using the Nikon CLS system. Now I have two Yongnuo YN560 IV units with the YN560-TX Controller and a couple JJC model FB-1 battery packs that plug into the flash units. The battery packs have 8 each of the Enloop Pro AA batteries installed and each flash has four of these batteries plus the transmitter and a backup set for all, so 52 batteries and a good charger. These are easy flashes to use with a simple menu layout - and fast to change from using off camera with the Controller to using on-camera. I think that it was better that I started with the Nikon flash, but what I have now came in less than the cost of just an SB-700 so I had to give it a try.