Hi-res is good but it must have a high bit rate as well, as high res, if you want a detailed moving images.
Roadhawk out of that lot for me. Big res (but personally I'd go 1080 at 60 over 1296 at 30) and crucially, resolution is supported by a high bit rate (up to 20 Mbps) and it'll take a 512Gb memory card. So you get decent images and a hefty buffer for recording. In the event of the worst, you'd have plenty of footage and ages to get the card out before it loops back round, all in excellent quality.
As for the rear, just buy 2!