Canibus - 100 Bars
http://www.youtube.com/watch?v=U9kT3zGDd3k
Swear words are a part of the culture dude. KMD didn't swear coz the culture was censored at that time. Definitely not taking anything from him, just commenting on your review of rappers in general.
This song is a 1 take cut, meaning that it's not freestyle, but he spit the entire song in one take without edits. ..and he did it perfectly, especially considering the flips and complex words rhymed with groups of words instead of straight up A+B rhymes. As far as lyrical skill, this is the clinic that is referenced by people who know better.