I bought a new bike this year and wound up swapping out the handlebars. The dealer from whom I bought the bike helped me make my choice. (Long story that dealt with spacers.)

I'd go to a bike store and take a look at what he already has on other bikes.

If you go to Koga Signature by Koga select Configurator, start with a frame (to get the process started) and then click on handlebars, you'll see eight options. That should give you an idea to start with.

I'm not suggesting you order from Koga as that would be expensive. This was just to give you an idea.