The projectors you speak of are not projectors. They are specially designed reflector housings to direct the light rather than scatter it. If you really want to go above and beyond retrofit some projectors in your halogen headlight housing. Not the look I'd go for but it's been done once before that I know.
Lincoln will charge like you said about $1200+ per headlight, if they still have them (thinking they do). They are high quality OEM HID though with it all contained in one unit. @joegr mentioned in another thread that he's never heard of one failing prematurely. Is it worth the swap, maybe to some, but others have put HID in the halogen housing, Shredicus adjusted where they point to not glare oncoming drivers as bad, and haven't had issues with how bright they're.
What kits are you running? Color temp? if you're running anything more than 4300-5000k you start to lose output. The bluer you get the more strain on the eyes, yada yada yada.