Don't pick a web site engine (blog, CMS, or other), unless you have the ability to customize the style. A web site should have the ability to change designs over time as personal preferences, and desired style and color preferences change. Sites using a site builder tool require a lot of hand coding or a complete re-generation of the site. This can add additional cost or time to customize. Sites that use a theme engine can be modified or changed quickly with minimal cost or time.
For a better example of what theme switching can do, see Themes Galore. More...