My kit is fairly fluid... a long time ago I had a Sigma EF-500 DG ST that I sold when I needed some money. About 6 months ago I traded a Sigma 50mm f/2.8 Macro for an SB-600 because I wasn't using it. I traded the SB-600 for a 55-200mm VR because I was going on vacation and wanted a compact telephoto. I sold the 55-200mm VR after the vacation because I wasn't using it. I just bought a Sigma EF-500 DG Super NA-iTTL because I also picked up a Sigma 24-70mm f/2.8 EX DG DF whose size and extension at 24mm makes the on board flash nearly useless. I say all of this because I've had 3 flashes at different times over the past 2 years. The first, an EF-500 DG ST iTTL was very basic but got the job done. The SB-600 was nice and compact along with having wireless abilities. The EF-500 DG Super iTTL is an awesome value an, based on my prior flash experience, the best value going at $119 from 47th Street Camera. It seems to have all of the features of the SB-600, more power than the SB-800, and the price of the SB-400. It supports 3-channel wireless (so up to 3 flashes controlled by on-board commander), a wider zoom range than the SB-600 (same zoom range as SB-800), higher guide-number than the SB-800, and the same built in wide-angle flash diffuser as the SB-600 and SB-800. The only major feater I see it lacking it the 5th battery holder. Also of major importance is that it has MUCH more consistent exposure than my older lower-end "ST" version... this have to do with newer firmware (it's 100% compatible with my D80 out of the box). Also, wireless setup is much easier than many reviews (and the confusing manual) make it out to be. All-in-all, I would highly recommend it to anyone looking for a lower-price iTTL option, or anyone needing an inexpensive multiple wireless flash setup (you can get 2 EF-500 Supers, 2 umbrella mounts, and 2 umbrellas for the price of 1 SB-800!).