Best theme to customise for CSS-only layout

I'm looking for a theme that I can modify to match a mock-up that I have been given by a designer. I want it to be table-less - i.e. a CSS only layout.

From looking through the themes page I've found a couple that look as if they might be suitable: sympal & foundation. Does anyone have any other suggestions or thoughts about which theme would be the best base to build on?

[Currently using Drupal 4.7, if that makes a difference.]

Thanks in advance,
James Harvard