Well, I was about to purchase an SB600 flash for my camera. Must say that at the moment don't have a lot of use for the flash but 400 I have decided against. Now the 700 is coming out, not really a hell of a lot dearer, which one. Also if I'm prepared to take a little gamble on ebay, the 900s are not too bad, which one do people suggest? Has anyone who knows the ins and outs compared the 600 and 700?