actually, set your screen to 800*600 and then use % table widths to make your webpages, if you have a 17" or above monitor, be careful of letter size...
you can also add a second monitor (15" at 800*600) with a twinview card, and do your browsing in one screen while doing your design in the other (comes handy because you can put your working palletes in e.g. photoshop in one monitor and the pic or graphic or webpage in the other) once you get used to it, you'll love it
if you're wondering, I use an evga card,
http://www.evga.com
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