PSoC as General Data Acquisition Block
Unfortunately I can't comment much on PSoC - it hasn't really solved a major problem for me.

What I can say is that you can connect you noisy resistive sensors to a PIC or AVR and then filter in software, so the PSoC isn't really solving a problem for you either.

For some sensors where a real amplifier is necessary before the A/D, then a PSoC might be useful, but I don't see it being important to your particular design, and may well be more expensive than the equivalent PIC/AVR solution.