I'll have to reccomend a TI-83 Plus, or the equivalent TI-84 (an 83 with more memory and a faster processor). My 83+ got me all the way through high school, Calculus III (multivariable calculus) and differential equations in college and is still useful now.
You can't go wrong with a TI-89 either. Just don't get the TI-92/93 or any other with a QWERTY keyboard: you can't use one on the ACT or SAT.
Slashdot Mirror
I'll have to reccomend a TI-83 Plus, or the equivalent TI-84 (an 83 with more memory and a faster processor). My 83+ got me all the way through high school, Calculus III (multivariable calculus) and differential equations in college and is still useful now.
You can't go wrong with a TI-89 either. Just don't get the TI-92/93 or any other with a QWERTY keyboard: you can't use one on the ACT or SAT.