I used to recommend the ubiquiti security system. Relatively inexpensive, all data stays onsite, wide range of gear.

But lately I've had some support issues and their hardware is next to impossible to find. Fun fact, unless you buy this from their site or one of a handful of authorize resellers, they won't support shit. I had a Cloud Key Gen2 from December of last year just die on me, but since I bought it from the Ubiquiti Amazon "store" (not actually sold by Ubiquiti), I was SOL.