If I understand exactly what you mean, perhaps you can find the right solution here:
http://matthewjamestaylor.com/blog/perfect-3-column.htm.
Try the following: set the total width at 100% and the left and right column at a fixed size. I expect the center column to adapt to what's left over of the screenwidth.
But, why would you want min. width to be 1150px? That's going to be just too big for a screenwidth of 1024 px which i being used still a lot. I would use min. width 984-994px or even 760-770px (for screens 800 px) if that's possible.
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