I would drop the Canon A520, as it has a long shutter lag. When Canon went from the A75/85 to the A510/520 cameras, they also went from 4 AA batteries to 2 AA batteries. This has resulted in a poor shutter lag of 0.9 second.
I can't decide between the Canon A610 the Canon A520 and the Kodak V530. The A520 is cheaper than the rest, the V530 is smaller than the rest and has the fastest "continuous drive" (3fps), and the A610 has more manual functions than the rest. How much difference in picture quality is there between these cameras? Does anyone have one of these cameras or have any suggestions as to which one is the best all around camera for the money?