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Graph 89 - (with TI84 support)?
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It is my favorite tool. I have the TI emulator on my phone because i never want to be without it. I use mine every day.
https://play.google.com/store/apps/details?id=com.Bisha.TI89EmuDonation&hl=en
If you didn't know, you can download an emulator for your smartphone (this one is android but there may be others). If you have the usb cable you can actually transfer apps from your calc to the computer and then load them into the emulator. I personally own this one (there is a free one available as well but the app is really well made so I decided to support him): https://play.google.com/store/apps/details?id=com.Bisha.TI89EmuDonation
FYI if you have an Android phone, there are some emulators available in the app store that let you load a full TI-89 ROM direct from TI and use it on the phone. Functionality is 100% identical. I used Graph89 and it was fantastic.
iOS, no such luck so far in terms of real emulators.
That's what I'm sayin!
Could just be an issue of familiarity but for me, when I use a calculator, it's either for work (engineering jazz) or in the midst of brainstorming/taking notes/analyzing something. Grabbing a physical calculator that is well laid out, has immediate access to all common functions, and whose layout I've largely memorized, is just so much quicker and "flows" without being disruptive vs. grabbing the phone and using an app. Plus there's no risk of getting sidetracked by notifications on a physical calculator.
I used to use Graph89 when I was on Android and it was awesome, but sadly no iOS equivalent. :(
If you have an Android phone, there's a free emulator for the TI-89 Titanium (based on TiEmu). I've used it for a while and it works great as an upgrade to a typical phone calculator. No ads or anything, so it's not annoying to use.
I don't know about CE specifically but for non-graphing calculators and engineering recommendations it is usually split between
Scientific ~$20
These two are usually allowed on professional exams if a calculator is allowed at all. So if you plan to take Fundamentals of Engineering - Chemical then learning how to use one of those two would be a good idea.
I have the Casio and I find it to be really good and there are tutorials online and on Youtube. Although the TI might have more info/help available based on how popular TI is.
Also if you only need to see a graph for homework or reports then you could use google (cos(3x)+sin(3x)) or any other graphing program like Microsoft Mathematics.
Graphing ~$145
The TI 89 Titanium has been around for a long long time and there is probably a utility for anything you would want to do. But the CX CAS has a great color screen for graphs and such.
As far as tutorials go the TI89 has some great websites out there. http://www.prenhall.com/divisions/esm/app/graphing/ti89/ http://www.antaki.ca/TI89Tutorial/
If you have the TI89 you might be able to use a program like graph 89 with the TI89 ROM that you can download from TI's website and use the TI89 for homework or whatever if your TI89 isn't available.
I would definetely purchase a calculator though because I don't think many professors would allow you to use your phone as a TI89. So you will probably need a physical version.
Hopefully some CE majors can chime in with something more. I wouldn't be afraid of getting the TI36x Pro and seeing how far that gets you if price is factor because it is a great calculator.
What calculator do you have now?
https://play.google.com/store/apps/details?id=com.Bisha.TI89EmuDonation&gl=US
Hard to beat an actual TI-89. The ROM can be obtained for free on the TI website.
Note: You can emulate the TI-84 on your mobile: https://play.google.com/store/apps/details?id=com.Bisha.TI89EmuDonation