I'm thinking of getting on of those creative x-fi cards their analog if i'm correct?
you can pretty much use any 2, 2.1, 3.1, 4.1, 5.1, 6.1, 7.1 etc digital amplifier/receiver to connect to your pc... as long as it has proper amount of analog rca inputs on it, or has a digital optical toslink input or digital coaxial input on it (but, pretty much just about any current receiver could be used, TBH, anywhere from under $100 and up)
(heres an example of new receivers at bestbuy, for as cheap as $120 for a 6.1)
http://www.bestbuy.com/site/olspage.jsp?id=cat03031&type=category
you can pretty much use any 2, 2.1, 3.1, 4.1, 5.1, 6.1, 7.1 etc digital amplifier/receiver to connect to your pc... as long as it has proper amount of analog rca inputs on it, or has a digital optical toslink input or digital coaxial input on it (but, pretty much just about any current receiver could be used, TBH, anywhere from under $100 and up)
(heres an example of new receivers at bestbuy, for as cheap as $120 for a 6.1)
http://www.bestbuy.com/site/olspage.jsp?id=cat03031&type=category