Nikon Basic TTL kit - 1 light
Here is a basic TTL capable starter kit. This kit includes 1 - 565ex speedlight, 1 - 622 trigger and the 622-tx controller. This is a great way to get using TTL off camera. The speedlight 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