hello all , im in the process of gathering parts for a new pc build for my girl . i have been using sony burners for a while now and would like to give something else a try . ive been looking at the nec 3500a and the nec 3520a . i dont see any differences between these burners . nec's site doesnt show any info for 3520a . is this because its too new or what ? where would one update firmware for the 3520a ? also on zipzoomfly the 3500a costs more than 3520a . is the 3500a better ? newegg only offers the 3520a at this time . is the 3520a replacing the 3500a ? thanks for the help .