I converted my specialized sirrus to drop bars. There may be a thread around on it, check what thread I created.
I do recommend the +1 route, but due to some issues ("but you just got that bike last year!") I converted. Bought the bars, with brifters, used on CL.
I had to get a road front derailleur, but the existing rear derailleur was fine. I also ended up with a shorter stem due to fit issues.
If you have canti or V-brakes you will need a take-up adaptor to get them to work with road brake levers. Alternately you could specific brake levers for V-brakes/cantis and do the shifting using bar end shifters.
I've got several thousand KM on the bike since the conversion.