Next weekend I plan on taking care of the headlights:

Hella euro-spec H4 housing:
http://www.busdepot.com/0301600118

Plus 6V halogen H4 bulbs:
http://www.busdepot.com/665543

Plus some 6V relays to keep current out of the switches:
http://www.newark.com/te-connectivi...lay-spdt-6vdc-40a/dp/21M4888?ost=21M4888

Plus a fuse block for good measure:
http://www.ebay.com/itm/MARINE-BOAT...Gear&hash=item3f2aec32e4&vxp=mtr

The Hella housings and H4 bulbs are already installed. They are drop in replacements for the sealed beam bulbs, so an easy job to swap: four screws out, swap bulbs, four screws in, next light....

The complexities arise when adding relays and rerouting wires. Still, it isn't that complex, just annoying as there is a bunch of time spent laying under the dash.