Sounds like you're within the 30 day return period so you can return/exchange your product for any reason. You'd just pay the difference in price between the two products and the extended coverage might be a bit more expensive if the new headphones fall into a different price bracket for the GSBTP. . There wouldn't be a restocking fee. So it'd probably be like $50 more for the headphones and few dollars more for the GSBTP, I'd assume.
Bring everything you have for the headphones, a receipt and a driver's license/id.
On a personal note, if you're spending $200+ on headphones, you should consider getting something decent. I get if you're getting the Beats as a fashion statement or whatever, that's fine...but if the headphones are for sound quality and comfort, stick with something like Sennheiser, Audio Technica, Shure, Grado, etc. With the Beats series, you're paying for a set for fragile $50 headphones with a $150 logo on them.
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Although I do work for the Geek Squad, all comments and opinions are my own.