Qvis does have a full D1 unit as a 4 channel, however we do not carry it because for a couple hundred bucks more you can get the 16 channel unit. However, we can get it for you if you need it.
One question though is, do you really need full D1 for a 4 channel DVR? Most of the time 7 FPS will be just fine. Unless you have the specific need for full D1, you can go with the regular Apollo HD and save hundreds of dollars and still get the same video quality, just at a lesser frame rate.
As far as comparing to monoprices, I have never used their DVR's so I cant attest to how they are, but just because two DVR's have the same exact specs does not mean they have the same quality. Things you have to look for are features, quality of the GUI, and video recording compression.
As far as the Aver's go, we carry them as well but just arent listed on our website. They are great little boogers if you plan on upgrading to IP someday. But if you are just sticking to analog, I would choose the Qvis.
Thanks for the response, I would like quality recording and basing it off some older cameras i had see i want more then 7fps. 15fps I dont mind at each channel. What is the price of the unit that will do the higher fps for a 4 channel and what Blackberry support is offered if any?