If you take a look at everything that comes with either the regular N73 or the Music Edition, the ME is your basic easier package.
If you try to clone the ME N73 on a regular N73, you'll probably spend MORE than the ME N73 is worth originally, and you still won't have the improved audio quality people have mentioned. The black housing, audio adapter, and 2gb card do a pretty good job of justifying the price. But, as people have said, you can do without the black housing and update the firmware yourself for less.
If the housing and sound quality are important to you, it seems the added $100 would be worth it, if not only for the convenience factor of having all those accessories in the same box.