Shooting fireworks is kind of like shooting lightning in that as long as it appears in the exposure somewhere, it'll come out fine. The trick is trying to make for an interesting composition, and trying to get just the right shutter speed. Too fast and you don't get as many sparks and bursts, too slow and blur from camera movement becomes too obvious.
Personally, I'd probably take the kit lens to go shooting a fireworks show. I find that wide angle shots tend to look more impressive and are less prone to shake, and having a wide aperture isn't really that necessary. I've managed decent firework shots with my digicam, but that thing has an advantage over my K100D because of it's infinite burst.