Honestly … I prefer the SB-600 over the SB-800. The SB-600 is smaller, lighter, less expensive and does everything I need.

Here is Ken Rockwell’s comparison between SB 600 and SB 800.
There is no need for the SB-800 or SB-900 unless you shoot with it all day long. You will like the size of the SB-600. The SB-600 works with every Nikon camera made for the past 40 years.

Pay attention you might screw it up if you remove the batteries while it’s ON.

You can dial in up to +3 to -3 stops flash exposure compensation on the flash. That’s more than you usually can dial in on the camera.Also it takes four AA cells of any kind, you might wanna try rechargeable AA for this.
Wireless slave mode works GREAT with few to no misfires due to misalignment.

Power ON and OFF follows my D80 and my D300 perfectly. For instance, turn off your Nikon DSLR camera and the flash turns off.  Don’t wait buy it !