Its rare to see people be specific as you are, so I am sure you will receive a lot of qualified bids.
However, I should probably tell you that 50GB of space and 1000 GB bandwidth are rather astronomical figures for a blog, even the busiest one.
My personal take is start with a shared hosting account. Your needs for the year will probably not surpass 1 GB space and you won't need more than 50 GB of bandwidth per month, unless it will be multimedia intensive - then its a different story.
For the space/bandwidth requirements that you mention you should probably consider VPS, but why pay for something you are not going to use?
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