I recently upgraded my GPU which was so wide i had to remove my Asus Xonar ST which i had for years and absolutely loved the sound quality. i have no other spare slots and have tried one of those riser extension cable things with no luck, the only other option without changing the mobo is a usb sound card, I want it to drive a set of Ultrasone Pro 900's, i don't use any speakers, I have zero clue about USB sound cards, i would like something comparable to my old Asus Xonar ST if possible without breaking the bank.