I'm not sure about replacements for the stock fixtures. Although I'm with you, I didn't want to spend a fortune on some driving lights after I paid a small fortune for my silverstars. So I came across some driving lights while at pepboys, called Diamond Blues, really nice. They have an aluminum housing w/ a glass lens. The bulbs are an H3, I know because I just had to replace one after I dropped it. But anyways, they are a really nice bright white and compliment the silverstars. The lens is clear w/ a slight bluish tint, but don't let that fool you into thinking they shine blue, they are whiter and brigter than the sun! Until I had mine aimed properly, I was being flashed by oncoming drivers all the time. And they are bright enough to drive w/o the headlights on. I use mine as DRL's and have them wired to the ignition so they come on w/ the car. They cost around $70, which IMO isn't all that bad for the product you get and how it performs.
But this is all just my opinion.
here's a pic.