Summary: The TI-83 plus is the perfect calculator for college. Many of the more advanced calculators are not allowed in class. This one gets the job done and is the one I've seen most of the instructors using as well.
Excerpt: My wife returned to college to pursue a new career in medical lab science. She had been using an old TI 83+ for statistics classes, but it had become unreliable- losing battery contacts in the middle of a test. So, when she needed this for a pre-calc course, I bought one at Staples.
Excerpt: My daughter is using her new calculator daily. She is learning geometry in 8th grade. She learned how to use all the function keys after studying it for a little bit. It helps her graph the functions nicely.