Headphones mic for $500-$600

I'm looking for headphones and mic for quite a while, i thought about Audio Technica ath ad 500x and Modmic 4.0
but i'm worried that it won't stick to it also do i need any sound card for it ?
Could you please help me what to choose?

edit $600 is the most i can spend

if $600 is your budget why are you looking at such cheap headphones?

For $600 you can get quite a bit.  First though, what are you going to use this for?  Will it only be for desktop use, or do you need this to be mobile as well?  Most high quality cans benefit greatly from being amped, and a dac (more or less an external soundcard) will generally improve audio quality over most sources, so that should be factored in as well.