Stick with the stock screen and bars for awhile, get your body used to riding in the more sporting posistion before you start investing in new ergo hardware.
The stock screen should be fine at your height, assuming you are sitting the bike "properly" (not overly hunched or overly upright).
Just keep in mind if you change screen, bar, or seat height, all the equations change.
And welcome to the family. DaveM will be along shortly with an official welcome and some links to peruse, and be sure to use the Search function before asking future questions if you don't want to risk the wrath of Dolson or OldNDumb.