Agile Project Management software

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Here's a list of software systems that ostensibly help manage agile projects. I'm looking at using Rally for our next project at work. Anyone have a good argument to try something else?

Our past two projects used the Scrum framework and were run with a combination of sticky notes, index cards and an Excel spreadsheet. Everything worked great except for a) tracking the sprint burndown, b) reordering the priorities, and c) making sure the spreadsheet had a high visibility.

Some other prerequisites: Free or low cost, secure, uses less time than sticky notes/spreadsheets.

• Microsoft TFS
• Rally
• Target Process
• Jira
• XPlanner
• Collabnet
• Scrumworks
• Sapient Resultspace
• Mingle
• VersionOne
• Basecamp

I've left Rational and Primavera off the list. They're too expensive, and too "heavy." I've also omitted Microsoft Project: that's great for setting up and planning a waterfall project, but it's heck to use that for ongoing tasks.