alright i know that there are so many sound cards...but whats the difference between the $200 sound cards and the $15 sounds cards. i know that there must be a difference between the qualities, but is there really a $185 difference? also i saw that a Chaintech AV-710 was recommended and that was only like $30 shipped, is that really a good sound card? would it be better than the stock one that i have now? thanks