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my site is averaging around 950,000 visitors a month last 3 weeks we have hit 1 million, with a total of over 600mb in data transfer.. we usually average around 8gb transfer a month.
i must say XOOPS has coped damn fine.. the only problems i've had are at peak times.. and yesterday we had 78,002 requests and a total transfer of 443mb in just 1 day..the hosting plan we are on is really beginning to slow things down.. so i think if it increases more then looking for a new host will be the next step..
surpass hosting looks the best package i have seen so far..
if u want as minimum transfer as possible then, try and reduce the file size of images etc, compress them more, try not to use full quality images etc.. compress them, but not too much as to degrade their quality too much.
if u have large images/photos, use thumbnails more and let the user click the thumbnail if they want to see the full image..