I hope someone have some suggestions.

I have a client that is looking for the following.

A website where people can upload one photo with info about themselves. It’s a contest to win a car. There will be about one million entries. People will vote for the best photo.

It is one category only and the first page should show the photos with most votes.

What would be the best program to use for this? I can’t use flicker or similar sites since the client will sell the database.

Thanks in advance

Tom