Going against the 'custom wheel' current here... but since you are building the bike with a Campy group, how about a nice set of Campy wheels? I can highly recommend all the Campy wheelset I have tried. Among the current model, I'd recommend the Shamal ultra titanium 2-way over anything else. They come with carbon hub body and they are an awesome wheelset. If you want to save $$$ any of the Eurus, Scirocco, Vento, Khamsin is an excellent wheelset. If you like colors (black or red) you can get Fulcrum Racing which is made by Campy and is very good quality as well. Given your weight I would not recommend carbon wheels or HED3 or any of those - I'm lightweight like you and have been blown over trying H3's and disc wheel on my ex-boyfriend's bike
As per handlebars sorry but i am no help: I use carbon 40's with a good reach and a good drop. But I've seen that a lot of people who like short reach/drop and narrow bars use those Salsa poco or the Deda 4 girls. Both too small narrow and short for me...
Good luck with the Colnago, and please please please post pictures