Chat solution Using Sockets

General information for the website: Need a Chat solution similar to [login to view URL] Description of requirements/features: Need a chat solution(Something like using [login to view URL] ) - like [login to view URL] (not everything they offer) but mainly like one to one chat, group chat and API to add group,peoples there so they will auto login and chat - this need to work with in my admin site, so let me know if anyone build a chat solution already and can show a mini. demo, am ready to accept and start the work right away. And cost is less than 500 $