i did lot of research
and got the DOD GS300
it is small and record 1080p - no LCD screen but it is nice and small
records automatically when you turn key on
and stops when you turn key off
easy to install - long power wire goes to 12V plug
Pro:
small, good quality, 1080p - use micro SD card, easy to install, very good video qualitly, loop recording when memory card is full.
Con:
setting up needs a small monitor or tv in order to change the setting, night time recording is a little snowy if no enough lights.
8GB micro sd card records 2 hours of 1080p
here is a sample @ 480p reduce quality in order to upload
here is another no sound @ 720P better quality but remember to change the setting on youtube in order to watch 720p
it is not cheap cost me $275
there are cheaper models of course
but like anything in life, you want better quality, you have to pay more.