LED's or HID bulbs will get you more light, but it MAY also be scattered in every direction. Another route you might consider is an upgraded headlight harness. The upgraded wires bring much more current flow to your existing headlight bulbs, giving you more light on the road. The upgrade harness uses your stock headlight bulbs and headlight housings.
If you look at a newer vehicle, you'll see they use a projector to focus the light pattern on the road. As far as I'm concerned, the best headlight you can get for an Excursion is one that has been modified by adding a high quality projector.
There's a guy that does these modifications over on the Ford Truck forum. You'll have to join that forum in order to contact him if that's the route you decide to go. Check out his forum posts with photos.
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