Projectors and BiXenon are not available for your car. Any projector-type headlamp you might find for your Taurus will be of unacceptably poor quality and performance, and will not comply with the applicable safety regulations -- there are a lot of what might best be called "headlight shaped toys" on the market for all kinds of vehicles, but very(!) few acceptable aftermarket headlamps from legitimate makers, and none for the 2000 Taurus.
Keep in mind that "HID kits" in halogen-bulb headlamps or fog/auxiliary lamps (any kit, any lamp, any vehicle no matter whether it's a car, truck, motorcycle, etc.) do not work safely or effectively, which is why they are
illegal.
The only legitimate/safe/legal upgrades for your 2000 Taurus will be to make sure the headlamps are in like-new condition (if not, replace them with new genuine Ford ones), install relays and good wiring to bring full power to the bulbs (along the lines of
this description), put in GE Night Hawk Platinum 9007NHP or Philips Xtreme Power 9007XP bulbs (don't use any others), and make sure the lamps are aimed carefully and correctly.