I am currently taking Algebra and need to buy a calculator for class. The instructor said that the lower end TI36 would work for the class. However, I will be taking Pre-Calculus soon. I will also be taking Business Calculus and Business Statistics 1&2 as well as other accounting and finance courses. Could someone recommended a model of graphing calculator that would best meet the needs for all these classes? I would like to go ahead and get one now at the start of all my math courses rather than buy new calculators as my courses progress, if possible.

Thanks!