Nikon TTL Starter Kit - 2 light kit
Here is a basic TTL capable starter kit. This kit includes 2 - 565ex speedlights, 2 - 622 triggers and the 622-tx controller. This is a great way to get using TTL off camera. The speedlights can be controlled in both TTL or manual mode from the top of the camera allowing you to perfect your techniques and photography skills.
Here is a video on how this system works - 622 triggering system