Ludz,
We actually had our dj create a sample CD of what he had in mind for us. That wasn't too bad ... but he also suggested that we not take any requests due to most requests coming from the younger generation (teenagers) and we really didn't want any techno/metal or rap.
80's stuff seemed to be the way to go. Greased Lighting is always a hit, Paradise like Saltheart said, .....get a sample to see where the dj's head is...and things will work themselves out. Don't worry, you won't be hearing much music anyways....
Get the pictures' session out of the way immediately......do it before you start tipping the bottle.
Good Luck and Best wishes -