hello, I have headphone with 40 ohms & my sound card has different choices if it go over 40 ohms will it ruin my headphone?

thanks every body any other recommendations

I am looking for a new decent headphones for or under 100 dollars. what's my options.   I will use it for every thing on my computer and I have this sound card ASUS Xonar DG  http://www.asus.com/Sound_Cards_and_DigitaltoAnalog_Converters/Xonar_DG/   Need help!  ...