<p>I used a TI-83 during calculus until it got stolen in mid-first trimester. I decided to upgrade to a TI-84 Silver Edition. The 83 works fine, I ran into little or no difficulties at all. However, using applications on the Silver Edition proves to be helpful at times. Inequalities of graphs, a separate periodic table (for Chemistry actually,) and many other functions. Since you already have an 83, I suggest sticking with it unless 1) it gets stolen, or 2) you desire the additional functions that make your life easier. The guy sitting next to me uses a TI-89. He tells me it works fine, but so far in calculus I have not ran into -many- things that his calculator can do but not mine. Hope this helps, good luck in calculus. Remember, it's not always the calculator, it's you.</p>