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If you are going to do anything with imaginary numbers or X-Y trig, I would avoid an 83 and go with an 86 or 89.
The TI-83s do their imaginary numbers as a power of e, not in the form of x+iy. Also, they are more oriented on radians, where the 86 is more versatile by allowing radians or degrees interchangeably.
This probably won't make a difference if you don't do anything with electronics, but if you do, avoid an 83.
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