As I begin rolling out my site reviews, you will find that I will not place much if any emphasis on the disk space provided or the bandwidth/month provided by the hosting service. Why? The amounts have become so high that for most webmasters, these numbers really are not too significant any longer. If a website becomes so popular that bandwidth is becoming an issue, congratulations, you have a hit!
These days bandwidth is CHEAP. So web hosting companies are providing more bandwidth than most people ever will need for their websites. So, if you are starting out, do not put much weight on the amount of bandwidth provided. If you already have sites, you know exactly what you need.
Another thing to consider with shared hosting, is that if you start using up too much bandwidth, or CPU, you should be moving over to dedicated hosting. Some shared hosting providers will suspend your site or insist you move to dedicated hosting when you become that large anyway.