Hey guys and girls of Tom's Hardware. I was wondering if you can solve a little problem I have. I am using a ASUS Xonar D2X at the current moment and was wondering if I should change to the Xonar Essence STX. I mainly use my headset which is the Sennheiser PC 350 and they already sound amazing on my D2X. But will it sound even more amazing on a Xonar Essence STX due to it having a headphone amp. I've been only using the D2X for 2 days and they keep amazing me. So the final question is should I return my D2X for a Essence STX or keep my D2X. BTW I have a Logitech Z506 speaker system which don't really benefit from the sound card and will soon upgrade to a better 2.1 speaker system or a better surround sound system. Also recommend me some good 2.1 speakers that aren't above $170. Thanks in advance.