Party recommendation for projector

Hey am thinking of having a party for about 50 people for my sisters birthday in March, was thinking of having a projector outside in the garden so we could have a slideshow of photos on the side of our wall. Have seen an Epson LCD projector and another HD projector to hire on Fat Lama. There are quite a few on there and am not too sure which one would be best for an outdoor party? Anyone have any similar experiences of using projectors for parties? Would love to know which you think would work for me?
Any advice would be much appreciated!
Cheers, Adam