For your needs, If i had to choose, I'd go with Gossip. It says she is friendly and easy to handle, which means she won't have the trust issues that some of the others had. Nervous horses aren't fun! I went through 3 months of torture with my buckskin, before the guy I work for came up with something that would help us get through her issues and trust me. Shes great now!!!
Gossip is pretty cute too, I don't think you'd have any probs going with her for trails and such. None of these will cut it for show, though.
If i picked another one, Connor would be 2nd. He looks like he would be an okay height, but being shy concerns me for a novice trainer. It takes a lot to get them over that, and some never do completely.