Oh..well. That changes things then. Since you are open to 100-200 you need something much more aero and lighter. The small airflow difference wil add up after 220km.
LG- Diamond.
It's on sale too. You could also look at the QUARTZ from the same company. Slightly lighter.
Louis Garneau - Diamond
This one from Specialized is a favorite of the TT and endurance crowd. Super light and sleek. That frontal vent channels airflow throughout your forehead and all around.
Specialized S3
If you are willing to go higher, then there is this:
Catlike - Whisper
My buddy and his bike shop team all rock that. As you can, VENTS! Super, super lights, can be adjusted to the point of insanity.
All of these will do the job for you. I know looks are important, but the helmet has to feel right.
WHen you put it on, tinker with it. Play with the straps and the adjustments. You should roughly have 2 finger space available between eyes and the helmet. Once you click the straps, and adjust it, it should be snug, but not tight and uncomfortable. Goal is so that when you tilt your head to any direction, the helmets does not slide to one side.
You probably know this stuff already, I just like to be thorough ;p
Again, any more questions, please ask away.