I have been running the bosch H4 setup for years with the 80/100 bulbs and the relay wired up. It is the only way to go, puts any new trucks stock headlights to shame. There are a couple of problems you have to be aware of if you chose to run the higher wattage bulbs like my 80/100s. Not sure if you will need to worry about these things with the 55/60 bulbs as I have never run those WEEKASS ones
1. They create an unreal amount of heat. So much that you will need to replace your plug and wires to the bulb at least once a year. It just melts them. Expecially if you are stopped and forget your highbeams are on. I have wired mine up with knife connectors for ease of changing and keep a spare pigtail in the glove box.
2. If you are driving slow (like 4 wheelin) with your high beams on and it is not raining and you drive through a puddle fast enough to splash the water up onto your lights you can kiss that housing good-bye. The cold water hitting the really hot glass just cracks it. Don't know what the bosch H4 is costing in the USA but here in Canada they are 50$ bucks a pop(each). You also want to run the steel cagelike covers for rock protection.
3. You need to use a larger relay and a diode on the relay to prevent the relay contacts from fusing together. On high beam the large bulbs draw enough amps to cause the contacts to arc when you go from low to high beam that sooner or later they fuse. The diode prevents the arcing.
Swank had mentioned that the high watt bulbs didn't last that long but from my experience the 80/100s have lasted about 2 years on average. I guess that if the wiring wasn't up to parr you could lessen the lifespan somewhat. At another 50$ bucks for each bulb I guess it matters.
One other thing is with the melting plug problem, I have been meaning to fashion a plug out of some kind of heat resistant composite like maybe mycarta. Haven't had the time yet but thought I would throw the idea out there. Maybe someone has an idea for a good composite.
Anyway thats my 2 cents, hope it helps.