Yeah, unfortunately. But if you're getting a calculator purely for its built-in math functions, HP-50's are hard to beat (I don't know of any other calculator with Grobner bases and a Risch algorithm integrator).

The HP-50 has an algebraic mode.

I cannot really answer your question since I don't own the nspire... Although looking now at the TI's website it does look cool... btw, question to others, is ndless possible on nspire CAS? or is it strictly to nspire without CAS?
Oh, and is the TI-84+ possible on nspire CAS? or is it only for nspire handheld

From what I know, ndless is possible on CAS but I have heard nothing about the touchscreen.  I'm assuming no until a new version comes out because it runs 2.0.  TI-84 isn't possible on the CAS, im not sure why but the CAS doesn't have the interchangeable keypads

I would recommend you not to buy anything yet. Someone might be able to make some kind of third-party CAS for the normal Nspire, or even just install the CAS OS on it (yes, I know that this isn't very legal). And there still is the possibility of calc84maniac releasing his 89 emu.

But if you need the CAS really soon, then I would recommend buying an 89 Titanium, instead of having 2 Nspires.