Audio/Video chat module

Hello Friends, I need a chat software that supports, one-to-one, one-to-many, audio, video and text chat with following features- 1) File transfer 2) Similes 3) User blocking 4) System should support at least 1000+ concurrent users. 5) Should work behind NAT/Firewall/Proxy 6) Buddy list 7) Chat Rooms It is important that end user can use it without download of any software. Chat Software would be a java or flash based. Please provide complete details about the working of the system, what all servers (both hardware and software) and any other software will it require. Details about all its dependencies. Pre-made and ready to go scripts are Preferred. If you have done a similar site before, then please provide all the details of such a site including video chat server and client software. I want to see the demo before selecting anyone. I will choose someone in next 7 days. I know that here lot of people have this script and sell it at very low cost. I can increase the budget if found a very useful script but lower bids would be preferred. I want the full source code so I can modify and integrate it with my existing modules. Thanks Himanshu Varshney