Most tops in the $20 or below price range have significant drawbacks, so it is hard to reccomend one over the other. Trompo Bearing or Bearing King, post if you have problems.
Also read this: http://yoyoexpert.com/forums/index.php/topic,25361.0.html
Fixed tip tops are fun too, but most yoyo folks take to the bearing tops a little more quickly.