<p>TI-84+ Silver, works great. Actually, my brother has used a TI-83 Silver through all of undergrad as a mechanical engineer. So really you don’t need anything more…</p>
<p>Casio FX-115ES!!! It’s only about $20 simplifies radicals and stuff, and even does cubic factoring w/ nonreals. Plus its fractions look like fractions. It made precalc easier for me (I supplemented with TI 84 Plus when I needed to graph)</p>
<p>TI’s are the way to go. They’re about a hundred bucks each (I would recommend TI-84+ silver or TI-Nspire which I’m using right now. However, the reason I bought the nspire is because our school has a problem with stolen TI-84s so I only paid the extra bucks to recognize my calculator when it’s stolen) and they will last you a loooong time. I’ve been using TIs since the 7th grade, so yay for functionality.</p>
<p>TI 84+ is awesome. It does everything you need it to, works really well, and I’ve had the same one for some 5 or 6 years and it still works like new. Definitely worth the investment.</p>
<p>TI 83/84 works well until Calculus. TI-89 can freaking do symbolic differentiation and integration!!</p>
<p>That being said TI 83 will work fine in Algebra II, although it’s a bit unnecessary unless your teacher has you do a lot of matrix stuff, maybe.</p>
<p>Might as well buy the TI-89 Titanium now. Why waste the money on a TI-83/84 and then on top of that buy the TI-89 when you’re in Calculus and beyond? You can a lot on the TI-89, from the simple to the very complicated. In Geometry, Algebra II, and PreCalc, you will not need the TI-89’s advanced functions at all, but in Calc, it will be so much easier with some of the material!!</p>