Many webmasters check for bandwidth before buying hosting package. They are in a misconception that the more the better. It is not a body building competition to buy more and more bandwidth. If you are planning to setup and information website that contains only text then 10Gb would more than enough for a month. Also bandwidth utilization depends on number of page views you get per month. One of my website has about 240,000 page views per month and it has flash games, pictures etc.. but the bandwidth utilization barely crosses 100GB mark… You can calculate the bandwidth required like this.. assume each page is about 100kb size..
Average Size of Page (in KB) 100
No of Page Views/month 100000
Bandwidth Required /month 9.536743
As you can see a site with 100000 pageviews per month needs 10GB /month… 100000 are for really large websites… and if you are planning to setup 10 such sites 100GB or 200GB/month plan would be ideal. and far more than enough. If you are planning for a personal website even 1GB is redundant… :) . But if you have lots of pictures, videos and other rich media you might have to buy a larger package or you can manage with free file hosting sites like mediafire. But now a days the rich media are consuming a lot of data. Text itself represent a low percentage of your bandwidth consumption.