WRAP has most of the features you mentioned in the blog post – breaking epic into multiple levels of smaller stories, breaking story into tasks, assigning and tracking defects for a story, tracking points for stories and todo hours for tasks/defects. WRAP has strong requirements management including product backlog management. Many charts like iteration/release burndowns, story burn ups, velocity charts, defects cumulative etc help track progress of project easily.

WRAP is popular for its ease-of-use, powerful historical reporting and competitive pricing (check out pricing at http://www.agilewrap.com/pricing.html ). And best of all, they offer 5 Users Free with no feature stripping upon sign up. You can use your 5 users FREE licenses as long as you want