i have the one that was just before the one that clark gilbert posted (the casio one)
very good especially once you get to learn it
i've lost the manual and the cover (i must have had it a good 7 or 8 years now)
Learn your way around it ad its godlike!
i also have this colour graphics calculator (casio fx something or other power colour graphic)
i really can't find it online. Its sitting on my desk in my hall as i have no need for it today. you can get support for it online and transfer programs off your pc into the calculator. Sadly i'm not allowed it in about half my exams but hey.
Tip
Learn where the functions are, there are so many its all catergorized
otherwise, here on the uni pcs there is the godlike math program of
Maple 10