First, if you're going to put headlights on the car, don't put driving lights in their place. They're not the same, and it's bad for everyone on the road, meaning you and anyone else driving. It would be best to get lights that are actually meant to be used as headlights. Headlights go to a certain range, driving lights are like five or six times longer range, which means more likelyhood of blinding oncoming traffic. Not the safest thing.
Second, if you're set on buying those, at least buy them from Susquehanna
http://www.rallylights.com/Optilux/optilux_2500.asp
Not only are they cheaper, but the guy is friendly, and will actually respond to e-mails if you have questions about anything.
Finally, I think it would be better to go with some of these:
http://www.rallylights.com/hella/90mm_modules.asp
The H9 version would be four times the price for two low beams and two high beams, but the amount of visibility is worth the price. Of course you could just go with two low beams and be done with it, though that's not terribly safe either.