I've been using Easton Diamond Flares for the past 5-6 years but only when on the bases. I have both a black lens and a light blue lens pair.
They are only $19.95 so I don't worry about breaking them. I spent top dollar on my West Vest Platinum, my hexpad shorts, my plate shoes, my base shoes, my Honig pants and Honig shirts but I see no need to drop $100-150 on Oakley sunglasses.
Just my two cents.