Hi I have these 15 year old logitech speakers (X230) which still sound very good compared to new 150-200$ speakers. I play 320kpbs via windows 7. Now I am looking to upgrade my sound by spending ~150-200$ more. So I figure that best investment would be to get a new DAC. Is my thinking correct? If yes, please suggest best DAC for this computer setup under 200$. Should not be too heavy. Thanks.