I'll recommend the Blackvue DR900S I've installed. I went with front and rear cameras. I've had several dash cams over many years and I like this one the best yet. The only minor downside is that even with a minimal sensitivity setting it detects too many potential events, but that's not a big problem. Accessing the videos is the easiest of any I've had and the quality is as good as I've seen.
I took photos so I can do a install DIY sometime, showing the wiring routing etc... but haven't gotten to it yet.