Help with tipping!!!

This is the most asked question on this board and I am going to ask it again...

How much for:
2 Limo drivers
2 DJ's
1 Photographer and 1 assitant
1 Video guy

I know the standard for the Maitre D' and the bridal assistant it is the others I am not sure about...Thanks ladies

Please Forum mail if you don't want to post it...Thanks