It depends on your budget. The Nextbase 512GW dual dash cam is reasonable, but it's about £135-£150 depending on discounts that are currently running. You can read what we though of it, plus see our video footage in our review here: kit.honestjohn.co.uk/reviews/review-nextbase-512gw.../

We personally found the footage to be a bit dark. It was a cloudy day so exposure was causing the lens a bit of an issue, you'll see the sky is very bright but the lower half of the recording is very dark. However, in better conditions the camera appears to perform fairly well. You can find examples of the footage on YouTube, like this one, which shows it records crisp footage in the right conditions: www.youtube.com/watch?v=w6cEj1qpCPM