Ah, thank you. What audio interface(which's both DAC and ADC) would you suggest for me?
By "interface" that automatically means they have both DAC and ADC. It's hard to recommend which one as I've only used the M-Audios, and I imagine that some will drive some headphones better than others much like DACs with amps (whether built into them or not). Tablix suggested the Focusrite, which are at competitive prices and I've read many good reviews about them.
Firewire is a faster data interface, kind of like USB but you're more likely to find them in Mac Pros. You can search for it on Wikipedia - I don't know the technical differences well enough.
Do I hook it through USB. My soundcard btw is Creative Sound Blaster X-Fi Titanium HD.
There are interfaces that use USB, so that's what you'll need (I only put in that M-Audio because I've used only the ones and that's the first one on my Google search too). Also, your soundcard probably won't matter as the Firewire will take over as primary audio device, bypassing the DSP on the soundcard (including virtual surround, if you're using that), so what will happen with games is you will lose positional audio but with an interface that can use a better microphone, those noobs will hear your voice insulting their mother in hi-fi tonality and dynamic range
On a more serious note, given your OP I thought you only needed it for recording and such, but now that you mention your soundcard, well then there's going to be that problem with gaming.
If it's all for gaming virtual surround will at least maintain your chances of getting the "rights" to insult those noobs even if your voice won't be going through an SM57/SM58, so you might as well stick with the soundcard and a decent gaming headset.