This is where i have to leave you in the arms of someone else as i havent a clue when it comes to soundcards
I bought some cheap0 £8 sound card from eBuyer. It does 7.1 surround though so im happy
You dont nessasasarily need a new sound card though. From my computer i have a 2 way sound splitter. One way it goes to my PC speakers, the other way goes to my TV...