I recently ordered RunCam Split
http://shop.runcam.com/runcam-split/It offers HD recording as well as analog output for the transmitter for FPV. So with one camera you get two things and latency is similar to Runcam 3.
You can read here how much latency matters to human and
what values are reasonable https://www.pubnub.com/blog/2015-02-09-how-fast-is-realtime-human-perception-and-technology/In short anything below 50ms you can't react faster, so that is good. Differentiating between 20ms and 30ms you can consider very hard
One can argue that flying faster = less update per part of meter, but it does not matter if brain/fingers can't react faster.
Just be aware that 10km/h = 10 000 m/h = 166.66 m/min = 2.77 m/sec so if you race at 30km/h that's 8.33 m/s. Assuming delay 100ms, which is 0.1s you get update of image every 0.833 meter each second. So you just need to be aware of this and keep safe distance. Your brain will adapt anyway and predict how to react when controlling aircraft, but good to be aware of this. Also PAL/NTSC system has 25 FPS and 30FPS limits, which is 1/25*1000 = 40ms for PAL and 33ms for NTSC refresh rate (different thing than latency). PAL has better resolution though.
FOV depends on lens you pick. IR makes picture ugly, but go ahead and check following again RunCam brand
http://shop.runcam.com/runcam-night-eagle-astro/http://shop.runcam.com/runcam-owl-plus/or also decent Foxeer brand
http://www.foxeer.com/nightwolf-v2.htmlThese seem really good, but are FPV cameras. Usually FPV and HD recording
don't come together. HD cameras usually have latency above 100ms so not suitable for flying. Except for few HD cameras that are designed to have low latency. But just read links above to make an informed decision what is better for your application.