Asus Xonar STX II

Hey guys, hope you're all doing well. So, I have a little question. I am using an Asus Xonar STX II 7.1 in my PC and I want to set up a home theater in my room. Now I could just go ahead and buy a set of a 5.1 speaker system, but considering the fact that my PC's sound card will be better than...