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I agree! I'm looking to find a provider for a new Xoops-based site. I find that these types of sites, especially those which aren't graphics-heavy, tend to take up little disk space.
With a new site, you never know how popular (or unpopular) it will become. So a base plan of 1Gb xfer + 20Mb would be good, and having the option to upgrade if needed, even better.
Brad