Hmm, hard to say going on specs alone as most high-end 1440p 27" displays have similar specs. For instance, using the comparison tool on the Eizo site shows little difference between the CS270, CX271 and CG277, displays which can cost considerably more than the CS. Probably varying levels of QC and features. I believe the PA272 is most comparable to the CX271.
For what it's worth, the PA272 is NEC's best display and is well reviewed, while the CS270 is Eizo's entry-level and I haven't found any reviews/tests online. On the other hand, even a low-end display from Eizo is still high end by any measure. It's your call.
Actually, since you already own an Eizo display, your current calibration tool (I'm assuming you have one) should work fine on the new one too, whereas NEC displays work best with their custom Spectraview colorimeters. Not that you would have to get one, they just get within a few dE fractions closer to perfect if reviews are to be believed... you'll easily get under dE2 either way.