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I have to add that Canon D20 permits to use simple build-in camera's flash with lens Canon 100/2,8 macro. So I always use in mode -1 step, usualy. Otherwise you'll think about good light and lost fly itself.
As Kahis said D350 too small (1), D20 immedaitely ready for job (D350 - 2sec of waiting, often critical) (2), D350 - 1 season of real job, D20 resourse and price - two time more (3).
Nikita