<p>get the 84+ silver</p>
<p>Remember, TI isn’t the only brand. </p>
<p>If you’re used to a Casio scientific calculator, you will RAGE against a TI. (I regret buying my TI-84+. I only use it when absolutely necessary, and bring two calculators to all tests so I can avoid using it unless I have to.) Casios are often cheaper. </p>
<p>You should also consider HP. The HP-50g is a bit less user friendly than TI (but you can turn RPN off) but is more powerful, and the same price. </p>
<p>Again, TI is horribly overrated. Don’t buy it unless you have and LOVE your TI scientific, or your teacher forces you to.</p>
<p>I’d get a ti-89. I have it and it’s great. For the ACT I bought a used ti-82 off ebay for $10. It’s basically the same thing as a ti-83 in terms of functionality.</p>
<p>TI-83+ and 84+ are very similar. I’m not sure about the TI-89, but a lot of what they teach in schools supplements the 83/84. An 83+ should be fine.</p>