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I'm sorry but IMO buying a SD camera in our day n' age is downright stupid.
instead - buy yourself a nice HD camcorder hv30/hv40's are nice if you dont mind tapes, there are similar cameras that take SDcards though so look around. it will cost a fraction of what you would dish out for a vx, and with the money you save you can make a handle and get a wide/fisheye.