My Camera, screen and head unit are all Alpine.
The monitor is a TME-M710, 6.5 inch widescreen and has 2 x composite video and 2 x phono audio inputs that go into a seperate control box. There is only 1 cable that feeds the screen with all the signals + power for the screen. The bracket sticks directly to the windscreen and the screen can easily detatch so the thieving buggers dont get their hands on it.
Accepts NTSC and PAL signals, has a built in speaker, is compatible with Alpine's sat nav systems. Have a look at the PDF manual for the screen on their website too for more info on the control box for the screen.
http://www.alpine-europe.com/typo3/index.php?id=tme-m710&L=16
The camera is quite amasing (HCE-C100) - using a fish eye type lense it can see a very wide angle around the back of the van although it does give a slightly misleading perspective of distance - although it doesnt really matter if youre still using your wing mirrors too. Another nifty thing it does is automatically flips the image, so whats on the screen is what a real mirror would show. Note though - its output is NTSC only - so the screen you use to view it on must be able to understand the american NTSC colour signal.
Incidentally the output from the camera is a 16:9 widescreen image and not the conventional, so it looks even better on the screen I have.
The camera also works bloody well in the dark too - the reverse tail lights are enough to see any obsticles on screen. The image does get a bit grainy in the dark - to be expected - but I couldnt fault it.
http://www.alpine-europe.com/typo3/index.php?id=camera&L=16
The head unit is also very good - plays DVD video discs and can also use a DVD filled with MP3 music - so you dont need to use an autochanger. It also has an ipod lead and can control an ipod via the head unit display. Also has an aux sound input (using a phono adaptor lead) so an external source like a playstation or a freeview box audio can be played through it.
http://www.alpine-europe.com/typo3/index.php?id=dva-9861ri&L=16
All this came from my local Sextons branch, but I know it can be had cheaper online no doubt. As for wiring it all up - did all that myself with a few minor alterations.
The camera is traditionally powered from the reverse light, but I didnt want it like that so I have run it off a seperate supply and mounted a new switch to the dash to power it. The screen hooks off the power from the stereo quite happily and cuts out when the ignition is off. There is also a parking break sensor lead on the screen - and as there is no electrical signal from a transit handbreak that I could see - it gets attached to ground to ensure the screen is always on (has a standby switch on the front of the screen too).
So yeah - its the dogs