Originally Posted by Thorsson 
No. If you have a soundcard (or even onboard sound) you shouldn't buy a USB mic, which is more suitable for laptops, as your sound quality will be worse and you'll pay more for it.
no........... your quality is not worse with a USB mic
The question is... with the advent of USB microphones and speakers which keep the signal digital for longer... what use is a sound card?
Now, if the sound card had USB pins/plugs and was able to accept the USB microphone and process it FOR the cpu, THEN, a sound card would be good to have still