You've received good feedback here. My only additional thought is the concern about your top tube length. Don't add drop bars without the help of your LBS to decide on stem length and fit. Even if you do the work yourself ( shifters may change, brake levers, taping, etc.), you want the fit to be right.
Also the drop position may affect saddle comfort. The LBS can assist in adjusting the tilt while you ride on a trainer - or you may need something more narrow.
I'm a believer in saving money where you can and only spending when you're certain...