Personally, the TI-89 has served me the best. I started with a TI-82 in highschool (used I believe), which was fine. This was also back at a time when the AP Calc test limited what calculator you could use. I'm not sure if the rules are the same today. However, I lost it beginning of my freshman year at collage. It was probably a good thing in the end. If you are at all considering Engineering (specifically electronic) the TI-89 is a wonderful tool. If you plan to take any kind of advanced math in college, the TI-89 gets my vote.
I haven't used it since I left school (mainly doing CS programming work now, so less of a need for it). But thinking back, I actually do miss it =)
Mark
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-- "Spread before you is your soul, so forever hold the dreams within your hearts. Through nature's inflexable grace, I'm learning to live" - DT
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