<p>I’d just get another 84+. They’re fast and reliable. This is after using many 83s, and owning both 84+ and 89. I’ve looked at the nSpire, and that seems to be a bloated mess that comes with neither the reliability of the 84+ or the roboustness of the 89.</p>
<p>Thing is, the 89 is more like a PDA and has a built in CAS, along with a nicer interface. The nSpire functions much more like a 84+.</p>
<p>Considering that you’re posting here, I’m assuming you’re going into college. As a tentative math major, my experience is that the more advanced you get, the less calculator you will need. In fact, ever since AP Calculus BC, I haven’t needed anything more than a scientific calculator (though, to be honest, I stuck with a 84+ since it is an awesome scientific calculator with lots of extras that I never use, like graphing). After getting done with multivariable and finishing all my physical science classes, I haven’t laid a finger on a calculator; not even a four-function calculator.</p>
<p>Thing is, calculators are for arithmetic, not for real math. Keep that in mind - a 84+ is cheap, rugged, and will do all that you will ever need to do, unless your are truly incompetent at math and remain that way.</p>