The Five Best Servers of Women's Tennis?

Eh. you can't put Kaia Kanepi in there. She's a good server, but when the top players are at there best, they are way better than Kaia Kanepi. So I think your top 4 are correct, however when at best, lots of players have better serves than Kaia Kanepi (Clijsters, Henin, Kuznetsova, Sharapova). Wickmayer has a good serve, Kvitova has a good serve, as does Aravane Rezai. Bashing the ball is sometimes less effective than good placement (Zvonareva, Pennetta, Radwanska, Schiavone).