Well, I would have to say "Carols S.T.F Remix" but if you mean the mixes that have been released with the singles, I would say the only good ones are...
Dance/Techno Type:
Heaven "House Mix"
Will "Wall5 Remix"
Acoustic/Orchestral:
Heaven "Piano Version"
Fairyland "Acoutic Piano" (from the "Fairyland" photo gallery slideshow)
Heaven "Acoustic Piano" (from the "Heaven" photo gallery slideshow)
I didn't like any of the others that much, especially the remixes on the Fairyland single
