Good covers are good covers.

ie. Hurt by NiN done by Johnny Cash- outstanding

or Jimi Hendrix's version of All Along The Watchtower

Of course these are widely considered two of the best covers done ever because they make great songs to someone who hasn't heard the original. (I haven't heard the origional Hurt and I don't feel the need to).

And Leeza, I'm sorry to say this, but I find the MM version of Another Brick quite... awful.