Chat Server Architecture for a Customer Service Software

I need to provide Chat Contact in a site where the visitors can chat with operators. The chats are channeled into different business organized queues: sales, support, product information, etc. Can you suggest me an architecture that would cover:

• Server side chat server with the queue routing, DB, operators online status, etc.
• Operator web application
• Visitors Operators
• Real time monitoring web site

I am taking a look to:

• node.js + Socket.io + Redis pub/sub: I have to implement all the messaging system
• XMPP server like Openfire
• RabbitMQ

What youd you suggest? any other idea?

Thanks