Which calculator should I get?

I recommend Texas Instruments TI-89 Titanium Graphing Calculator The TI-89 Titanium lets you perform the expected functions of an advanced model--basic math, algebra, calculus, graphs, matrices, and statistical functions--and do cool stuff like creating animations, graphing 3-D rotations, and plotting contours. Graphing functions include basic function graphing, parametric graphing, polar graphing, sequence graphing, 3-D graphing, and differential-equation graphing. Additionally, the TI-89 Titanium includes symbolic manipulation, constants and measurement units, statistics and data plots, a numeric solver, a text editor, programming capabilities, tables, a split-screen function, variable management, and the ability to link to other calculators or a computer. a href="http://www.amazon.com/gp/product/B0001EMLZ2?ie=UTF8&tag=digitsy-marina-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B0001EMLZ2" rel="nofollow"http://www.amazon.com/gp/product/B0001EM…/a