Question : Firewall

I have a big network spanning covering many areas head office with power of 500 all branches about of 200 users except one site with power of 500 users which product in juniper fillfull the privacy and protect my wide network Ihave tomention the data is top secure so Ineeda powerful fire wall devices

Thanks

Answer : Firewall

Have a look at Juniper's website , do some research and decide from there what you need.

http://www.juniper.net/products_and_services/security.html

In my opinion you can't go wrong with Cisco though, I would check out the Cisco ASA firewall.
http://www.cisco.com/en/US/products/ps6120/index.html