I have the NRX 852s and the GLX 852s. The Stradic 2500fh, stradic 2500ci4, stradic 2500ci4+, sustain2500fe.
Personally I like the Ci4's pair with the NRX. Makes a nice, light combo. The sustain seems to pair well with the GLX. The Sustain is the smoothest, but that Stradic fh is not that far behind and it would be hard for me to justify the price difference if I was on a budget. The two Ci4's are noticably lacking in smoothness compare to the Sustain and fh. For me the weight factor is more important when fishing the NRX. All four are excellent reels and so far have held up very well with just routine maintence as all Shimano reels seem to do.