Nokia 6620 as mp3 player

Hello all,

I just purchased a Nokia 6620 phone and am thinking it might make a good
little mp3 player if I can get the right hardware. Just had a few questions
for others who own this phone.

Is the hedset jack capable of stereo output. I cannot use a bluetooth
headset as that will be used by a handheld GPS unit.

Are their either stereo headsets available which output decent quality audio
or perhaps adaptors which can be used to connect to a standard pair of
earphones. The latter would probably be prefered as the earphones could
then be replaced easily if damaged.

Is there a maximum capacity MMC card which the phone will accept. I'm
thinking of a 1gb card but want to make sure it's compatable.

Thanks in advance,
Shane