Suffusion Options -> Sidebars -> Sidebar 1 -> Default widgets for first sidebar. Switch off the widgets there.
elatorre wrote:Also, the meta box includes far more than I'd like it to; is there a way to edit it?
There isn't. You can use a text widget instead, and provide links for whatever you want to offer.
elatorre wrote:I would also prefer not to include the post count in categories but this is another entry in the sidebar that does not exist in my active widgets.
If you add a category widget to the sidebar after doing the first step above, you will be able to control this.