.,...but for those who still like to engage in conversation rather than instructing people to search.....
Never had any need for ABS if you know how to stop the car without it, its not a problem! In the real world you'll not notice the power/weight difference and as realnumber1 says the engines seem to vary quite a bit in power output!
The only think Id say I miss with my Cup over the standard 172 is xenon lights, rest I'm not to bothered about. My main reason for buying the Cup though was because I liked the colour/wheel combo better. I test drove a few standard 172s and to be honest the difference is negligible speed wise unless your into pub talk figures!