Opinions on graphing calculators?

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http://forum.allaboutcircuits.com – I'm a mechanical engineering student. I'm looking for thoughts on a good graphing calculator, that will be sufficient going forward. Up until now I've been using the online utility bcalc.net. That was sufficient for my online algebra classes, but I'm moving into on-campus calculus courses starting this January. I've been researching the TI-84 Plus C Silver Edition, but I have no clue if that would be a wise choice, or not. My course syllabus mentions that the TI-89, TI-92 and equivalents are not allowed. I'm not sure why. Any thoughts would be appreciated. Thanks! (Embedded)