It turned out that my TI-89 cannot be used in linear circuit analysis II, because it is a graphing calculator. I bought a new calculator mainly because I was sick of working with complex numbers (i.e., a+bi) on a standard calculator. A calculator that can handle complex and magnitude/phase math was needed.
A friend bought a TI-36x Pro but I plumped for Casio's fs-115MS, in part because it was in stock at a nearby store and I didn't want to wait. Once I had it at home I worked through the tiny accompanying manual, which shows it does a broad range of things, though I wish it could do matrices.
I have had some frustrations with it, but mainly because it takes time to adjust. One is that I must choose the complex number output setting in advance, as either a + bi or polar form. Storing values is awkward because it took a while to realize that I must store with the Ans key sometimes; otherwise the calculator will perform, again and unwanted, the last operation then store that value, thus storing something you don't want.
All things considered, it is a nice calculator. However, I do wish classes would allow other things. Life would be easier if I could use MathStudio on my iPod on a test.