Road drops are probably your best bet, but try to pick up a few different kinds on the cheap and see what feels best.

It also depends on the kind of riding you do. For running around town bullhorns are tons of fun, but I prefer track drops for training rides in the park (especially for climbing!).

And don't forget to get some good tape/grips/gloves...I see bikes around all the time with bare bars and they look all kinds of uncomfortable...