Buy a TI-84 Plus Silver Edition, used; Added features of CE and disadvantages make it a better choice.
I own four TI Graphing Calculators. (Two TI-83 Plus, a TI-84 Plus Silver Edition, and this CE)
Speed? I'm sure when I start writing my own BASIC programs, I'll appreciate the CE extra program space and speed. Thus, if you already own a TI Graphing Calculator and you've found that it is slow, or that it has too little memory to do what you want it to then buy the CE. Otherwise, stick with a TI-84 Silver Edition.
The CE can't connect to the old keyboard (which I have); which is a real limit when typing programs. It's really annoying to have to enter letters with the hunt-and-peck method even when Alpha Lock is turned-on.
I can't run programs on the CE that were created for the TI-84 Plus.
I can't communicate with either the two TI-83 Plus or the TI-84 Plus with a cable, either.
So, all the advantages of a CE are eliminated by the disadvantages. The size? That's crap. The difference is size or weight is not discernible. I'm was not at all impressed by any difference in size.
So, if you like to impress other people, then get a CE. In reality? Do you really need color? Do you really need the extra-big screen? and it takes quite a while to charge the CE. Since batteries have always lasted a long time with all TI calculators, swapping-out alkaline batteries is MUCH quicker to do.
So, my recommendation... but a used 'like-new' or 'acceptable' condition Silver Edition for $55.
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Verified purchase: Yes | Condition: New