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The real question is why do you want to run above 1600x1200 with a nvidia anyway, when you can see how it looks like $hit at 1600x1200? >>
The reason is clearly stated above by me, but I'll paste it down here for your convience

"Really, I want to know why my GTS can't do 16x12x32@85Hz. I get wobbly verticle edges of windows. It only does this at 85Hz, 75Hz works and looks great. My V3 3000 can do 85Hz and looks fab, it'll also go higher than 16x12."
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I don't think you have completely ruled out the monitor driver yet: >>
I've installed the Sony driver 3 times, and for the third time, device manager says the Sony driver is installed. I can see if the different OS was maybe the reason, but your tellin me that 98SE won't allow over 16x12?