I love bullhorns and moustache bars. Moustache bars are pretty versatile though.......I use 'em for fast pack rides, climbing, etc...
Drop bars can earn you extra style points especially naked (no tape, no plugs) but to me are very uncomfortable on long rides. Here are two of my Mbar equipped bikes.....

http://www.tc-homes.com/bike/forum/fg-bikes/leakos3.htm
http://www.tc-homes.com/bike/forum/fg-bikes/leakos2.htm