Hello! After some disastrous internal shots I did for work recently, I decided I need to get more flash power from my camera to avoid all this blurring I'm getting in low light conditions (or I could just be a rubbish photographer - I've not ruled that out yet) I want to buy an additional flash for my camera (Kodak DX6490). I've seen a few in Digital Camera shops on line, but don't know what I'm looking for. What's the difference between the cheapest and the most expensive (apart from price obviously)? Can anyone recommend one? Is it safe to buy one second hand from eBay or should I get one brand new? Your help would be very much appreciated.