I have a Casio FX-300ES that's lasted me all the way from middle school through college-level calculus. It's pretty much invincible, though I have currently misplaced it.
I had a Casio FX-9750GII, but it got stolen because it was soooooo much better than the TI-89. For one thing, it had a dedicated fractions key! For another, the interface was a whole lot more intuitive for people who'd never used a graphing calculator before. And you could also edit equations after you input them and got an error instead of having to type them over from scratch.
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