Relatively unknown in the space, Spin Chimp Pro is surprisingly effective and exceptionally easy to use. Lack of personalization options can be significant drawback, depending on your use, it’s still a contender in best of class article spinning options.Link: http://spinchimp.com/
Cost: $127 one-time or $59/annual as of April 27th, 2013.
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Contains an extensive synonym list and features word density and similarity analysis tools. Features readymade and easy-to-change spin formats for a variety of pre-existing networks and platforms. Allows for letter spinning (ASCII-based) if that’s useful to you.
Inability to customize personalization options (providing your own synonyms, removal of replacement suggestions, etc.) or reuse prior protected keyword selections.