I congratulate you on your choice. I too prefer flat bars because it is hard to find the kind of bike I want with flat bars. I converted a Cannondale CAAD 8 to a flat bar (the LBS did the work) and it worked fine. I liked the bike but it felt too small after the conversion. The problem is that the flat bar was closer than the hoods on the drop bar where you would typically ride. Consider replacing the stem in order to extend your bars a few inches. Also, consider riding 28's on your wheels. This will give you the feel and stability of the hybrid without sacrificing much (if any) speed. I much prefer the shifting and braking lever systems on the flat bar vs. the drop bar.