Thanks for the comments (all)!
Like I said, I already have two cameras. And I am indeed seeking an 8-cam-capable DVR. Now it seems the Apollo 8 is what I should get. The price ($265 no drive) is actually LESS than those $600 packaged 4-cam+DVR bundles I'm comparing! Even if I separately get the hard drive, which is what I would want to do anyway.
So I take that Qvis is a more reliable brand? Reliability is my top priority, with performance and features next. One thing I'm reading about the Qvis Apollo series is the triple output-- BNC, HDMI, VGA. I really need two physical displays connected, so hopefully this is it.
I've never heard of Qvis until now. Are they like the Honda of DVRs? I mean, I wouldn't mind getting the Hyundai of DVRs, you know. Hyundai and Kia are better than Fiat and Triumph.