how tall psd doesn't really matter as long as you have all page components laid out in there then, once you slice it into html you can repeat say scene blocks with various scenes, thats just a personal preference of course. while doing designs for clients we usually fill up tour page with 2-3 scene blocks and when site goes live it can become really tall.
width wise, 750 is too tiny nowadays imho unless you definitely know your target audience mostly uses 800x600
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