Logo alignment

Hi there,

I've been playing for a few days now with Atahualpa and I am enjoying it. I've followed these great forums and I've managed to lift my nav. menu and align to the right of my logo.

I've given the logo a set margin of 'margin: 0 0 0 300px;' Which becomes a problem on smaller res browsers and it knocks out the menu. What I really want to do is align it with the left margin of the body, problem there is I've set the body to 60% width.

The header look I'm after is similar to what these guys have
http://www.simplethemes.com/

thanks in advance for any help.