Graphing Calculator---worth it? I plan on majoring in either computer engineering or electrical engineering (have yet to take any related classes, so we'll see how long that lasts) and my calculus 1 teacher recommends that we have a ti-83 or 84 (made it through precalc with a B without it), but said that we can NOT use something "high-powered" like the ti-89. So I was wondering: 1) Is it worth the money to get a 83plus or 84plus? 2) Which one would suffice for engineering? I looked at the comparison chart on TI's website and it says that the more costly calculators are "for engineering"... 3) Should I get the 84plus silver edition, since it has more RAM? 4) Do higher math classes require the more higher powered calculators? So should I just wait and spend the money on the "better ones" in the future? I read somewhere that I'm better off just downloading a free graphing program or virtual calculator, but obviously that won't help me on a test. Right now I'm using a Casio fx-115ES w/ natural display. Thanks in advance!