Best Jet Li movie I've seen (Black Mask) is more of an homage to a Bruce Lee character.
Anyways, it's hard to top Bruce. The guy was just amazing with the choreography in his fight scenes. But the thing that I think really set his movies aside from all those that followed is the fact that Bruce was scary fast.
Fist of Legend, is the best Jet Li movie in my opinion. Its the one where the mentor is killed by a rival martial arts school run by Japanese and has Li/Lee return home for revenge on the evil imperialist outsiders.
Van Damn just did 4 or so movies with fight tournments (Bloodsport, Lionheart, The Quest, Kickboxer)