I've had a few different sets of "aftermarket" bulbs, and the best I've used so far are a "J-Spec" brand as the whole package is written in Japanese or Chinese or soemthing. I got them on Ebay for 21.00 shipped, and I absolutely love them!! In fact, I just helped a friend who liked my headlights so much, he had me help him install a H4 conversion on his Chevy Blazer! Now, the beam pattern with these lights is what they refer to as "sharp" or "focused", which means you won't have alot of light outside of the beam pattern(like US Spec headlights), but I prefer them. They cast a very bright white light with a very faint blue tint, that really illuminates anything thats luminescent(e.g. street signs, reflectors, etc.). I live in the Berkshires in Massachusetts where I don't think they've figured out that there are these things called streetlights; because when it gets dark, there's no way of telling whats going to hop, skip or run in front of your car
Therefore, I like to have as much light available when I'm driving at night(especially with my son in the car), and these have been great!! They're 80W/85W(I just got 85W bulbs for the factory Classic fogs, BTW)and I have had no problems with the factory wiring melting, burning, etc. In fact the only time I've had people flash their lights(very,very few)are the idiots with SUV's who blind everyone anyway when they get up behind you.
Sorry for rambling....My 2 cents worth.