Sorry, I changed to picasa and cant get the pictures to post.
Electric pumps certainly don't run out of gas, and gas motors last alot longer if they can be sheltered from the elements when not being used and that can be a pain. I think an electric pump is fine if you have the right situation, and it sounds like you do. Its not too hard to find specs on different pumps in order to make an educated decision. I would definately lean toward bigger is better. You will be happier in the long run.
Eddie