I'm sure some suggestions will come along, but the only advantage I see with drop bars and climbing is the use of standard drop bar, road brake levers - and even this is only for standing. For sitting climbing I find riding on the tops most comfy. Maybe I'm the minority, but I find it uncomfortable to climb in the drops. Having said this, are you looking for drop bars to use with standard road bike brakes? If not, there is nothing wrong with bar ends on flat bars, or better yet some bullhorns.