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That's exactly what I've done using this CSS method Monty. I set a max-width of 999 pixels for an optimised display for screens of 1024x768, but I am not ostracizing 800x600 users in the process. Basically it means the theme is dynamic (no horizontal scroll bars) upto and including 1024x768. Then for all screen resolutions above this it is fixed width. This way I can find a balance between ensuring my site content is displayed as I want it on all resolutions (advantage of fixed width), while at the same time minimizing lost real estate on the page from having to account for the lowest screen resolutions all the time (advantage of dynamic width).