[gunhound45]

recommend me a list of everything I need to connect the phone to the pc.
 
and under $100.
 
I will be doing 50% gaming if that makes any difference...

 

[Symbiote]

I've had a Xonar DX for a while which should be able to drive those headphones.
 
Check out some reviews about the soundcard.

 

[taisho]

HD555's don't need to be amped.
 
But, my HT Omega soundcard is reallllly good and turns out to be a monster once you change the op-amps. However, it's outside of your budget.

 

[Adda]

If you want a portable/external soundcard for your HD555's, the Audiotrak Prodigy Cube would be a good choice.