Just fitted one of these onto the passengers side and it looks great! Because of the angle of the dash, fitting a motorized HU into a mk1 would be difficult, not to mention stolen within a week. Heard that sunvisor TFTs werent too good. Managed to find one on ebay for £92 UK delivered, no customs charges. Didnt have high hopes cos of the low price but figured id sell it on ebay if it wasnt up to scratch. Am pleased to say i was pleasantly surprised. When i tested it indoors, i found the picture to be brighter around the edges, but this goes after the unit has been on for a few mins and when fitted, its not noticeable because there is more ambient light in the car. There are also different settings for use during day/night etc. Fitting wasnt great as its a universal fitting. Found i had to modify the supporting plate, by getting rid of the metal bolt thats there and supergluing a short length of plastic pipe to screw the bracket into. This allows it to sit about 20mm higher up, making it less visible to thieves, leveling the screen and making it much more sturdy. It wobbled like mad with the standard bolt. The hook has to be fitted on the other side as the existing mount is too close to the roof console. The headphone socket didnt seem to work at all, so i wired another one directly to the internal speaker, so its cut off when the socket is used. TV reception isnt too good, i guess it depends on location. It has 2 inputs, and a reversing camera option, wired to the reversing lights. I have a 40gb HD divx player (good for about 50 films) as my video source. Its about the same size as a calculator, so its easily hidden / removed and you can connect it to any tv. Another ebay purchase at £120. Heres some pics, the screen looks better in real life.
http://erc.qmuc.ac.uk/cliosport/gallery/full/1100275414__sunvisorb.jpg