CMS - When to use?

Hi to everyone!

Im a web-developer/designer and I'm having some doubts about when to use a CMS.

A client asked me to build a small company webpage, the design was made in photoshop, than I created the CSS and HTML from the photoshop file, and now comes what should I do next.

He wants a small news post, and a job post and for me I could see 3 solutions:

1. PHP+MYSQL () - create a page with a form for the client update news and jobs (title - date - content text) in a database;

2. PHP only - create a small external piece of code with

< li ><h1 >title </ h1> date <p > Content< /p> </ li >

and the client had only to edit that small file and i create a include of that file in the page.

3. CMS - And here comes the time where Im feeling quite lost.. Theres thousands of CMS's over there, and all seems alot of work to configure if you have your own Page design. Is there any good and simple CMS that alows me to have my own design??

Also, another issue I came across, some CMS , from the client point of view, could be too complicated, just to add a simple news.

If someone as any opinion or idea about this , I will be much appreciated for your posts...
Thank you...