I've owned a '94 and now have a '00 NSX-T. The '00 feels a lot quicker than the '94, but that could actually be due to the close ratio 6-spd than the actual 20 hp difference between the two. Overall, the '00 rides more smoothly and is quieter, and the power steering makes all the difference in the world at slow turning speeds. The only drawback is the decreased visibility to the rear due to the targa top storage cover. I guess you won't notice it if you haven't driven a coupe first.
As far as $75K for a '99, that's pretty close to the cost of a new one, especially if you wait for a factory incentive. But the car has such low miles you'll probably have to pay more than what an average '99 goes for. BTW, you sure that is what's left on the original warranty? As far as I know, it should be 48mo/50,000 mile warranty. Hope this helps.
------------------
'00 NSX-T, silverstone/blk, #252