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I'd go with #3, myself (but I have years of experience with 4" belt linishers (they are not sanders)). My dad was a metal (brass/steel) polisher/plater and I used to help him out to get 'pocket money' - we didn't get paid for chores, we were simply expected to help out.
The round one is fine for edge sanding when you need it straight and flat. For curved edges, you use the belt. You can use the belt for flat bits, but it takes a lot more skill to use properly.
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