Le Matrie is a good brand, I've used it love it ect.. You may also want to look at Pyropak though. I have used that more than Le Matrie and have had no problems. Also rule of thumb for pyro is that the effect MUST be done by a properly trained pyrotechnician, and that you keep the effect at least 15' from any curtains, persons, scenery, ect... Also the fire marshal will tell you as much, but ALWAYS keep at least one fire extinguisher manned and ready at both sides of stage, and that fire personal must be present for each time the effect is used. Thats what will KILL the budget for your effect. If I may ask where are you doing this effect? (City/State/Country) That will effect how hard it will be to be approved for the effect.
If you have any other questions please feel free to ask. If I don't know the answer I know people who do.
Hope all goes well!