For body .. which depreciate more .. but good to buy new, as electronic item, just safe to have warranty.
Lens, it is ok to buy used, rarely hv problem, but then they dont depreciate as much as body..
I bought new body, but usually buy the "KIT" then sell the lens off, so that can lower the price for the body a bit, and then I am selling brand new lens for lower price, easy too.
Just a hint, Canon/Nikon, their warranty is not transferable, and unlike HK, shops here usually put your name on the receipt. (or you can ask them not to)
Flash light, I do suggest to buy new too, as you dont know the life time on it, so it could die anytime .. ( can more or less see from the condition gei .. just not as simple as lens )
For newer lens, pretty much only thing can go wrong is the internal motor, (AFS) and could be expensive. Not common problem on Canon, (I have owned some Canon lens for more then 20 yr, not problem) but say Sigma, and some early AFS from Nikon, their motors are not that reliable.
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