TI-83+ or TI-86?


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TI-83+ or TI-86?



I am  soon going to purchase a TI graphing calculator for use in discrete math class in college and calculus later on, but do not know enough about differences between calculators.  I have narrowed my decision to get either the 83+ or the 86.  Any opinions which is best and why?  Is the 86 updatable like the 83+?  If not, is this an important consideration?
Thanks, in advance.
Ted