Firebird lighting options have been talked about a lot in the past, but not recently I think. So I'll go through the basics. There are different stages according to price and the amount of work you want to do.
The most basic is what I have at the moment. I took some Wagner stock lights and cut out the back bulb area and sealed in some Silverstar H7 bulbs. If you have a dremel it's pretty easy to do. It's a brighter white and it's definetly an improvment over the stock bulbs. Bulbs were $20ea and I had the housings. A full write up by someone else is here:
http://www.fullthrottlev6.com/forums...star+headlight 
On my install I used High Temp Copper RTV just to make sure they stayed put.
If you don't want to do the work and can spend more, you can get conversion housings for around $70-$90 that uses a removable bulb. They use metal housings with glass lenses.
eurolamps (dot) com/eurolamps/camaro_headlights.htm
The next step would be to mount projectors into the stock pop-up housings using a regular bulb. Most HID projectors can be used with slightly modded halogen bulbs like the H7. I have some Bosch E46 projectors and they use a D2S bulb, but the Silverstar H7 can be made to fit. They look pretty awesome at night and the beam pattern is great. They also seem brighter than the same bulbs in the stock housings. If you care about looks, this setup looks super nice at night. It's almost like the HID's.
There's 2 main ways to do this. The cheaper but more work way is to get used projectors and make a housing that will seal them up and fit them into the stock location. This will pretty much only cost the price of the projectors and bulbs. A fellow named WS6 did this on the LS2 forum.
Note that he used the E46 projectors as well. They fit and are awesome units. His pics are gone, but I still have all of them. I'll post a few below.