10GB is generally plenty for the average site. Just for some reference, 2 Create a Website has a ton of videos (many Flash videos over 100MB), I have over 150 pages, a ton of images and I'm only used 1.5GB of space. The size of video depends on the quality. If you are going to have very large videos in the highest quality possible then they may take up more space so it really depends. Remember, you can always upgrade your plan with ease. The email addresses provided are the there for you regardless of how many people join your site. Site traffic has nothing to do with it.
You do not have to have your site completed. In fact, most times I buy hosting before even starting.
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