NVR recommendations and retailers for home use?

So I'm after an entry level, 8 channel NVR to replace my DIY Zoneminder setup.
I'm not sure where the recommended places are to buy CCTV equipment for home users would be, nor what I'm really looking for when looking at an NVR

I have a few requirements and a few 'nice to haves'

Requirements:
Supports 3rd party wifi cameras
4 channels

Nice to have:
Record events to external NAS
Supports upto 2k streams
8 channels
Access storage via network share