hey there,
it's quite good budget for no description,
I have been working with Cisco VoIP since 2001 and Asterisk and freepbx ,trixbox, elastix since 2007.
I also have been working with Cisco routers, switches since 2001 ( back then 2950 were quite expansive :) )
That being said I would like to have a little chat about your project to better understand the needs of the project
regards,