Not swaying you from LTS brand if that's what you want, but if you want true Hikvision USA, the 32 channel NVR, will work for you, the DS-9632NI-ST. I can get you pricing if you want, but figure about $1,599 shipped including sales tax for the NVR and honestly, not going to find it much cheaper in China with no warranty. You'll also need a 24 port PoE switch, would recommend a ZyXel GS1900-24HP, would have to research pricing, but figure $400-500 for the GS2200-24HP if you want a managed switch in the $600-700 range. Also, you'll need hard drives, 1,2,3,4TB drives available just about anywhere, would recommend the WD Purple Series, priced well, design specifically for NVR use.
Cameras are cheap, depends if you want their low end with 2-axis design (has to be mounted facing down, not on a wall), or a 3-axis camera that is more flexible but also more expensive. Figure about $150-200 each depending on features.