Need some advice with Headset + soundcard

Cotton_

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Aug 26, 2014
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Hi community,

I'm getting a new headset and i was looking to buy myself some decent ones this time.
Not super expensive, but atleast decent quality.
(was usually going with simply conventient headsets for max 50 euros)

Now, i'm a Mad Catz fan when it comes to their mice cause of the looks, so i was thinking of going with a Mad Catz F.R.E.Q. 7.
http://www.amazon.de/gp/product/B00BCSYZR8/ref=s9_psimh_gw_p147_d0_i1?pf_rd_m=A3JWKAKR8XB7XF&pf_rd_s=center-2&pf_rd_r=0BVD4JX4PP05EG9F4MPC&pf_rd_t=101&pf_rd_p=455353687&pf_rd_i=301128
^that one

Now my questions are about the compatibility with my soundcard.
I have a Xonar DG 5.1 sound card cause i love to listen to music on my PC and the quality increase is great cause i had a Realtek ALC887 integrated all the time.
Now this Headset has both a 3.5mm plug and a USB plug, (either one, can't have both at the same time.)
So will my Sound Card go to waste if i plug it into a USB slot?
Will the 7.1 go to waste if i plug it into my sound card ports?
Wich of them will produce better sound?
Or, should i get a different headset alltogether?

Advice from someone who knows something about audio stuff would be very appreciated, cause i am definitly not that person.
 

Cotton_

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Aug 26, 2014
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Since no one bothers to answer my somewhat longer question-txts as usual i put a TL: DR version here:

I want to get a Mad Catz F.R.E.Q. 7 but i also have a Xonar DG soundcard, will those play nice together or will one be wasted on the other.
Also, are there other headsets you would recommend?