I'm still running the old school lights, one is an H4 and the other a sealed beam (after a rock took out one of the H4s I didn't want to replace the pair). They suck, both of them do, I've been toying with the idea of an upgrade but here are the issues I have with H4 type units: during water crossings water gets in through the back and I have fish tanks with blown bulbs, if a rock hits them no one is selling just single replacements so you're on the hook for a pair.
LORDCO will sell single semi-sealed Hella headlights. They don't have them at the stores but they have them in the warehouse and in their book. However, the price for one is only about $10 off the price for a pair. They always come with 12V bulbs. I usually pay around $85 for a set and then do a bit of a trade to get another set of 24V H4s. I have heard very good things about the CIBIE semi-sealed lights that Daniel Stern sells. If you tell him your issues, I am sure he will only sell you the product that addresses your concerns or he won't sell you anything.
I've now gone through a few sets of Hellas. I now also have a set of IPFs (ARB) that were a fair bit more than the Hellas. I really can't see the difference between the two. So when i did the headlights on Lety's Safari I just put in another set of Hellas. I think my next broken set will be replaced with CIBIEs. They'll be a bit more than the IPFs but perhaps Daniel Stern will also pull out the standard 12V bulbs and give me a deal on 24V bulbs.
You could also try Gregg Distributors. They sell a lot of lighting products in 12V and 24V. If I find my catalog CD, I'll check it out.
BTW, don't wast your money on the ARB headlight lense protectors. I am sure they would work fine if you could get them to stick.
Of course, if people are consistently having problems seeing a night while driving, perhaps it is not the headlight. Maybe they just need to get their eyes checked and a pair of glasses.
Perhaps we can mark up the outside wall and parking lot at Steve's new digs.