The best I know were mentioned : I want you back (Kenny Hayes remix), Never can say goodbye (Nepture remix), I wanna be where you are (Dallas Austin remix). I also love
Dancing machine (Paul Oakenfold remix)
all these remixes are from album Remix Suite, there are other good ones too
also:
It`s your thing
Give In To Me (Konstantinos remix)
Dangerous (Colin Pepe remix)