Actually put on a few pretty large displays myself.
$1000 goes a long way if buy them at the right place, 15 minutes easily of some really good class C. Consumer fireworks are actually more than you need and I'm not referring to those stands on the side of the road. For example those stands on the side of the road would be selling those flare type sparklers for like 3 bucks for package of six, anybody buy any this year? Anyhow we'd get like a 100 packs for $10, bottle rockets were like $8 a gross. I even have account we were shooting so many of them at one point in time.
We had so many bottle rockets and firecrackers the one year the kids got bored with them.
For my grand finale we'd get a "One big Mutha" (or soemthing like that), 2 merlin magics, and about 6 300 round saturn missiles. Fun, fun, fun... nothing like watching a few hundreds go up in smoke.