Conference Management Web Portal

I was looking for some web-portal for arranging conferences. For now, the winner is CiviCRM - http://civicrm.org/.
The post is open for your suggestions/feedback.

Basic features required:

• Showing event details
• Direction maps
• Information for the audience
• Inviting audience
• Confirming attendance
• Payment Details
• Self-payment
• Receipt printing
• Managing inventories
• Delegating Administrators for each events
  

Initially I thought, there will not be more choices in this category of software, which proved to be wrong.

Options analyzed:

• Website:

• http://usecod.com/

• Information:

• http://vimeo.com/16512306

• Good:

• Integration with Drupal
• Ready to use
• No/Minimal coding required
• Fits most of my needs

• Bad:

• Only compatible with Drupal 6.x
• Right now in Beta mode (not a Production - Stable - release)
• Payment Gateway Integration seems to be missing
• The road-map seems to be pretty dry; has not been able to keep pace with Drupal versions
• No Demo available

• Website:

• http://www.simplifythis.com/

• Information:

• http://www.simplifythis.com/demo.htm
  

• Good:

• Integration with Google Apps
• Its not basically a Conference Management Software, chances of molding it to the requirements
  
• Ready to use
• No coding required

• Bad:

• Not free
• The two pricing options are confusing me, do I need both? http://www.simplifythis.com/pricing.htm
  
• Can I have more than 1 organizers? May be not.
  
• The road-map seems to be pretty dry; has not been able to keep pace with Drupal versions
• No Demo available