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As you are dealing with a lot of unknown variables it is quite hard to give an accurate figure. I can tell you however out of experience that with 300 members 25 Mbps is nowhere near enough.
So the most important thing is to know your overusage rate up front to avoid huge bandwidth bills. Shop around before you pick a hosting provider, every host can deliver elevated x and probably for a lot less.
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ICQ: 267-443-722 / leon [at] adulteuhost [dotcom]
Nominated for an XBIZ Award as "Webhost of the Year" in 2007, 2012, 2013 and 2014 
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