Determining server bandwidth required in data center
Is there a way to calculate what bandwidth is required for our web server prior to our server going live in a data center?
We have a web store, do mass emailings to our list of 25,000 customers, and woluld like to also start audio streaming for an internet radio show, handle 1-hour podcasts for the show, and progress into making a library of 4-5 minute video tutorials available online to members.
I am running a LAMP stack on RHEL3.0 and using OS apps such as drupal, PHP List, Sugar CRM and RT.
The data center has offered us a 1.5 Meg dedicated pipe (not to exceed 1.5 Meg) +$75/Meg excess, or 10 GB total for the entire month.
I have no idea if I should choose a dedicated pipe or aggregate monthly bandwidth, or if what they are offering in bandwidth will even be adequate for my purposes. I have no history to base any of this on, as we are coming from a hosted environment on a shared server.
Does anyone have any ideas on how to approach this?