Do You Need a CMS for Your Site or Not
It is now a very confusing question that You need a CMS or not for your business website. I hope this article will help you.
I’m not gonna tell you what cms you should use in this post.
If you need to update your site frequently you should think about CMS, but If your site is just a information website, a static site without CMS is better. Here is pictorial diagram from SeoMoz.Org.
Hope this will help you find your answer.
If you need any suggestion or help feel free to ask here in comments.