I am looking for a chat room solution similar to the one on StackExchange to facilitate more responsive communication between the contributors on Open-Org.com. My criteria are the following:No Flash (this rules out more than half)Full history (meaning that it is possible to access all previous conversation for future reference.Very customizableNo ugly IRC stuff filling up the chat view (I do not want to see who joined an who left etc.)No private conversations possible (this is just not in the spirit of Open-org.com)A hosted solution with a reasonable price.These criteria are so different from this question, so this is not a duplicate question.The service which matches this the closest is Chatroll.com. However, at 199$ per month their prices are outrageous. 
Which hosted chat solutions offer the following?
looking for a script;chat;hosted service