I have just selected and purchased the Kongtop (good reviews) which is the same or very similar to the unit you have in your link. It as both the visual and sound connections, others on eBay may not, so best to check at the lower price range items on sale for this specification. Mentioning lower price range, I paid £58.86 delivered next day, no hard-drive fitted. You might also find that the sellers are using different trading names, but are the same company outlets?.
You will also need a hard-drive, and the purchase and size of this will depend on what limits you are wanting for recording. I purchased a 2TB drive from Ebuyer, but for the difference in price, might pay to order direct from the recorder supplier, already fitted.
If you require new camera's then look at Ebuyer Quickcode 429696 to see if they fit the bill. Great value and I doubt if you will better the price. They come complete with long leads ready to fit the recorder!.