I have just recently bough a set of these headphones. Right now I am building a computer and can afford a soundcard at around 100$. The sound card needs to be able to create me some virtual surround sound as I am going to use it for gaming as well as movies. Furthermore I think i need an Amplifier. The budget for that is 100$ as well. It can be as big as it needs as space is no problem. Of course it is okay if I use 30$ for sound card and 170$ for the AMP.
That doesn't matter, I just can't exceed 200$ when i'm done.
(Sorry for bad english. I am from Denmark)