I often ask myself when building sites: "Wouldn't this be easier with static HTML pages?". The answer is only ever yes if those static pages are all the site will ever be, which is rarely the case.

Your site will probably grow in size and scope. Don't underestimate the value of all the plugins & themes available to help save time long term.

Have you looked at WordPress yet? Many of those "features you'll never use" aren't actually in the core. You get them as needed with a plugin. That said, the 3.0 core does include a lot more.

Don't worry too much on what you decide, WP is standards compliant, so it's not too difficult to switch your css, html & content into or out of WordPress if you change your mind.