Incentive to donate

Hey everyone.

Ive been thinking on how to reward those who donated.

One idea came up.

Select 5 People who donated and through a raffle each get $ 5k.

The problem I guess is who will do the name pulling just so I don't get accused of cheating or any other legal issues. I am not even sure if doing this idea is legal.

Anyways, if anyone can give me a suggestion about proceeding on how to do this would be great.

Thanks.