I swear by my Hario grinder. (Available locally and crate & barrell, probably cheaper elsewhere online).
http://www.crateandbarrel.com/hario-...rinder/s256234
You definitely need to go with the conical ceramic burr approach if you're having trouble getting a consistent grind.
Downsides to this one are that you've got to do the grinding by hand, and it's not easy to adjust it back and forth between different grinds. Great if you're going to set it once and then keep it there. There's also a lot of mods that people have made to this grinder to get even better performance out of it.