Media player for 3230

Does the app. in which music is played affect the sound quality???
if yes, then cud someone please suggest me a good media player app for my nokia 3230..

Also tell me, stereo sound depends on the phone or on the headset or on the software?? <Coz 3230 plays Visual Radio in stereo>

Which is the best headset i can buy for max Rs. 500..

can a Sony Ericcson headset be used for this phone (3230)??

Thanks in advance..

<i tried searching for a related thread but cudnt find one specifically for 3230>