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I didn't even know that helmets were made to a certain pitching speed. 
If it was my head I would get the highest rated helmet possible.
Helmets have certifications for certain levels of play. Purchase a helmet with an appropriate age certification.
Rawlings does have a line of helmets that offer specific protection tested at the various pitched speeds. The MiLB had a few years ago mandated these 100MPH helmet from Rawlings, and several players had commented that when hit in the head with a 90MPH+ pitch, they were able to jog right off to 1B without much of a thought. Those helmets have several different layers / section o materials that absorb the blow. There was talk about making players in the minors keep wearing them when they get to the Majors since they would be use to it. The helmet is quite a bit larger than what you see in the MLB, and would likely not go over very well with veterans.
Good helmets...I'd recommend....and go with the highest rating they have.
Now if they could only do something for the pitchers!
