I find it easier to just break it down into categories, for what my client wants.
ie - graphic art(images that will be needed), front end, back-end. And give a rough estimate that way.
Example:
Images- Logo - 75$
- Naviagtion Bar - 15$
- Animations(gifs) - 50$
- Flash - 100$
- Full Template - 300$
Code- HTML(2x) pages = 50$
- backend-php-only = 50$ per page.
- backend-php-database = 250$.
But as a more direct response to your question...maybe 350$+. Depending on what you what exactly your client wants.
But I also like what CouponGuy said. I am currently working for a hourly rate, of about 20$ a hour.  adds up quickly, so give it a shot.
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