Everything you asked is easily doable with an 'out of the box' installation of wordpress. But Id have to say sending the same feeds to each blog isn't going to get you to far and you are far better off being specific with your blogs. Like one per niche is a good start.
Also, if you don't feel like spending all day writing, or paying someone to do so, I would only start with one blog, or keep plugging away on the free domains like wordpress.
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