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btw you can add/reduce width and height of your existing psd documents, reducing is usually done through cropping to selection (menu: image/crop) and extending dimensions through menu: image/canvas size. that's why above i mentioned that height doesn't really matter
what Vendzilla said is your work-area can be very wide if you going to do some fancy stuff around main content area.. and then select reasonable width area in the center where all content goes (up to 1000px is fine), you'll have plenty of space around not to feel too constraint and it will provide you space to position overall page background pattern or image. I don't recommend scaling up or down whole area - its best to work with real scale without the need of resizing it later on.
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