I would like
720p or higher quality recording
Expandable storage, SD card or similar.
Is a rechargeable battery an option? Would potentially be used in multiple vehicles during a day, cigarette lighter power not necessarily available.
Windscreen suction mount with quick release would be ideal.
LCD screen not vital
Would need to be mountable on a vertical windscreen, think truck or bus
Would prefer to pay more for a brand name device, as opposed to a cheap miscellaneous brand.
One like this looks pretty awesome, but fairly expensive.