ti 84 silver edition a very good buy.

I bought this calculator for high school and college. It is a very good calculator with many features. So Lets start with the hardware features.

15 mhz processor
1.5 mb of flash rom
500k ram
high contrast screen.

Features
This baby can calculate polynomials, tvm finances, statistics, matrices, and much more. It even has a converter and vector calculator. You can do spreadsheets and pie charts with ease. It also has something called notefolio where you can write journals and stuff like that. On math tests where we are required to memorize definitions I just write them to notefolio and pull them up when I need during the test. The best thing is you can use it on ANY test!!