Ive seen good reviews of that camera model and the price was comfortable for me - although if there are better models for the same price or cheaper then please point me in that direction.You will not be able to update the firmware. There are newer 2mp and 4mp cameras that are better than the 3mp in low light..
As far as the NVR goes, that price is outstanding from my research. I cant find that model for that price, everywhere i look is 4x the price.
Will not updating the firmware be an issue? I usually shy away from updating things (drivers for pc or software for phones) as it becomes a giant headache and offers no real useful changes.