Once again I need advice from the experts, this time I'm in need of a PCI sound card solution to replace on board audio on a Gigabyte EX58-UD4P mobo. As you can see PCIE 1x is not an option since the mobo has a useless slot blocked by a heat sink. I can also get a used PCI Creative Audigy 2 ZS, but I think that may not work as desired since the card is quite old. What I need to know first is if the on board audio on the mobo is worth replacing? My PC is used pretty much for movies, music and gaming, I have logitech THX 5.1 speakers and I really love surround sound while gaming. These are my options, please advise me on which one to get: HT OMEGA STRIKER ASUS Xonar D1 AuzenTech AZT-XPCINE Creative Sound Blaster X-Fi XtremeGamer More recommendations under US$100.00 will be appreciated, many thanks in advance!