Drop bars give you the most hand positions, and as I am forever pointing out, you don't set them up for riding on the drops (this puts the bars too high), you set them up for riding with your hands on the brake hoods (where they'll be 99% of the time). This can put your upper body in very close to the same position it would be in with flat bars, or you can use a longer stem or lower bar position to distribute more body weight to the front (a full racing position would be 40-60 front-rear weight distribution). The drop bars give you the option of going into the drops in headwinds; uncomfortable, but more streamlined. Be aware that if you switch to drop bars, you will also have to change brake levers, and there's often an incompatibility in cable pull for brakes and for front derailleur.

L.