Sound Card for Focal XS 2.1 Speakers

Hey guys,

So I recently just got a pair of Focal XS 2.1 speakers as a gift. I was told that in order to make the most out of these speakers, (since they were quite expensive for desktop speakers in my opinion) I should buy a new sound card.
Can anyone suggest me any solid sounds cards for my speakers? My budget is $150.
On a side note, since my speakers use USB instead of a 5mm headphone jack, does the sound card?

Thanks in advance!