would usb sound better than a sound card


I am experamenting with pc audio and like what i hear.i am using windows vista and a sound card with coaxial out.i am using a deqx dac-it sounds very good.i was wondering if i can get better sound using a usb dac.and it seems a lot of audiophiles are making this harder than it should.i mean using foobar with this sampling rate,and doing this and that.it seems like it is too complacated.can i please get a simple version of what sounds best.thank you.
128x128gotsouldr
Splaskin,

Thanks for the correction - I don't have Leopard yet so I did not know that. More reason to upgrade. :)
Steve, are you sure about this? I am on Tiger and have been on the fence about Leopard, but trust your opinion since you have a Wavelength DAC. Did you really hear a difference? And how can I confirm the drivers were updated?
Here is a link on a discussion we had about this:

http://www.audioasylum.com/forums/pcaudio/messages/2/24965.html

Yes, I can hear the difference and it is significant with my DAC and system.

But given that all of this is subjective, I can't promise it will be better for you. Just the nature of this stuff.
I have a Cosecant, so it should be able to reveal the difference. You're on a Crimson right?

Anyway, thanks for the information!