I just cant seem to find it here..

Anyways, im building a PC for recording. I have a basic behringer xynyx mixer, running into an m-audio mobile pre usb interface. My question is, do I shell out $$ for an extraordinarily nice sound card, or is that unnecessary, considering my interface is usb.
Audio interface is basically an external sound card the way I understand it, so therefore give the pro sound card a miss.
The below is false.
The above is true.

*world implodes*