Base curb weight on the 2000S was about 2855 lb, It's about 2950 lb in the new base model, the new car is 100 lb heavier in base form. The engine is 255-hp/214-lb-ft in the new car, 252-bhp/225-lb-ft, the old S still has more toque and will give you a little more push when you hit the gas. Acceleration, although close, will still go to the earlier S. Both cars come stock with 17" wheels, throw 18s on either one and it'll probably be slower than the other.
As far as the change in HP ratings circa 2005, this was a clarification of the standardized testing for rating horsepower. Some manufacturers were testing without all accessories and under varying conditions, some weren't. For this reason, the horsepower rating effected some manufacturers and not others. Apparently, Porsche's (along with other Euro manufacturers) numbers didn't change.
http://www.caranddriver.com/features/columns/c_d_staff/larry_webster/horsepower_confusion_and_resolution_column
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