Wish I could be of more help with this as we *really* like our home CCTV system. But ours doesn't record, was installed as part of our security system, and was pretty overpriced.
Still- a few tips:
Get the best you can afford. Consider IR illuminators if your outside areas aren't well lighted. Get more than one camera- cover what needs covered. Get more than one viewing station, you'll never be in the right room when you need to see what's going on out there. We have about 8 viewing stations and I wouldn't mind more.
More like what you're considering, I got a recording CCTV system installed at a local mausoleum (long story). This was a couple of years ago and my memory is prety foggy, but anyhow...They used a control lunit to work with two cameras and hard-drive type recorder instead of tape, and IMO that's the way to go. Since you'll hardly ever actually *look* at the recording, you want the least hassles possible. You record a lot, only view it when something needs looked at, and that takes a lot of time if you're using tape. Plus the hard drive setup works better with multiple cameras. Plus, it has resolution quality that's been accepted as courtroom evidence
These systems also work with the multiple cameras in a split-screen type of way. This was an indoor system, and IIRC it cost $2-3K. Call a few security companies and get quotes. The one I got for the mausoleum was the same basic system everyone was selling, but I was able to get it for a fraction of the cost that some guys were asking.
But this stuff isn't cheap...a guy I know has an "inexpensive" system in his house and I thought it was pretty crappy.