Which should I get first: a better headphone or a dedicated sound card?

Scarecow

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Aug 13, 2014
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Hello and thank you for taking the time to read this.

I have two things I plan on getting over a stretch of time: the Audio-Techinica M50 headphones, and the Xonar U7 soundcard.

Problem is that my budget isn't really busting at the seams, so I'll have to wait for quite a while to get the second one if I buy one out of the two.
My question here would be, if I want to get better sound quality and first, should I get the sound card first, or the better headphones first?

My current headphones are House of Marley's Positive Vibrations headphone, and I'm using the onboard audio on my ASUS Z97-A motherboard.
Thanks! :)