Suggest good max-width for fluid width design

My websites uses fluid width design. The CSS looks like this:

#wrapper {
    min-width: 960px;
    width: 90%;
    max-width: 1200px;
}

The min-width must be 960px but I am open to suggestions about width and max-width keeping in mind that:

  • Majority of visitors have 1366px or wider screens
  • There is a separate version for mobile website (so no need to go responsive)
  • I need some left and right margin for background to show
  • The website uses two column layout (25% + 75%)
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