Blog Templates

Now I have a new addiction - other than TPT.  It's looking for a blog template.  The one I have now is a freebie from blogspot.  I am realizing that there is an enormous selection of templates with an enormous price range from $300 to $10.  How to pick one?  I had no idea what an amazing business this could be for someone.  If any of you have any recommendations, I would love to hear from you.  Thanks, Susan