I've had a TI-84+SE for a few years now, and it's served me well throughout high school and through most of first-year engineering. There are things I really like about it:

- Really efficient, simple interface

- Great keyboard layout with nice big buttons

- MathPrint is really essential to me

etc.

I rarely graph with it, but use the functions, tables, solver etc. regularly. I also regularly use it linear algebra tasks like systems of equations.

I have friends with a CXII CAS, and the CAS clearly opens up so many possibilities, with things like

- Symbolic Calulus

- Symbolic Matrices

etc. I have a feeling I would learn lots of other useful tricks with CAS if I had one.

So if I wanted to upgrade to something with CAS, what would you recommend? The CXII CAS is very expensive (even on used market), and in my time using nSpire models (my HS had a class set), the tiny keys and touchpad are inefficient to use. I'm sure it wouldn't be as bad if I got used to them, but how much? Also, how much difference is there between the different nSpire CAS models, especially if I'm not graphing? The original one from 2007 seems interesting with the bigger keys and no touchpad, but I'd like to hear from someone who's actually used it. Older models like the 89 have no MathPrint, right? Do they bring anything interesting to the table?

I know there's a lot of questions here, but I figure you all probably know the calculators well enough to give great advice.

Thanks,

Ron

- Really efficient, simple interface

- Great keyboard layout with nice big buttons

- MathPrint is really essential to me

etc.

I rarely graph with it, but use the functions, tables, solver etc. regularly. I also regularly use it linear algebra tasks like systems of equations.

I have friends with a CXII CAS, and the CAS clearly opens up so many possibilities, with things like

- Symbolic Calulus

- Symbolic Matrices

etc. I have a feeling I would learn lots of other useful tricks with CAS if I had one.

So if I wanted to upgrade to something with CAS, what would you recommend? The CXII CAS is very expensive (even on used market), and in my time using nSpire models (my HS had a class set), the tiny keys and touchpad are inefficient to use. I'm sure it wouldn't be as bad if I got used to them, but how much? Also, how much difference is there between the different nSpire CAS models, especially if I'm not graphing? The original one from 2007 seems interesting with the bigger keys and no touchpad, but I'd like to hear from someone who's actually used it. Older models like the 89 have no MathPrint, right? Do they bring anything interesting to the table?

I know there's a lot of questions here, but I figure you all probably know the calculators well enough to give great advice.

Thanks,

Ron