If you get a windshield you won't regret it. I've said before, I don't know how people ride without one.
While sitting on the bike if the top of the shield is about even with your upper lip it'll be fine. The wind hits it and goes up, usually the wind you'll feel with a windshield is coming up from underneath the shield. After I got my bike it was only a month or so that went by before I got a windshield. Huge difference in my attitude about riding higher speeds especially for longer periods. Without the shield your upper body acts like a parachute for all the wind, bugs, and road debris. I couldn't stand highway riding, I'd have to pucker up my face and hang on for dear life. Then when I'd get home my jacket would be covered in bugs, face too.
You can get used to riding without a windshield but once you have one for a while it's hard to give up. Less wind noise in your ears and less wind fatigue on your body for those longer rides. I know people that ride without due to not wanting to change the style of their bike but for me having a windshield makes the motorcycle experience a whole lot nicer.