I use a TI nspire CX CAS.

honestly, I think it makes no sense to spend more than 30$ on a calculator if it can't do symbolic math.

The way you input things like division, integrals, matrix, etc. on newer calculators like the nspire is far superior than the older calculators (eg. ti-84, ti-89, etc.). They look like how you write them on a blackboard instead of relying on purely parentheses or "," and ";" to separate parameters. It's like going from Excel to Mathcad