if you want good pens, bics and kilometricos are ok but staedtler ballpoints are good too.
if you want consistent smooth pens, and you have the moeny, buy parker pens and a couple of refills, they are really smooth. inky pens will smudge unless you leave some time for absorption.
if you want to just use ball points, i suggest you warm up the barrel, then the ink is not freezed up and ink comes out better. just rub the pen between hands or put it in your poket where it will get warm.
hope it helps