This is the one I grow up a wall in my garden. I'd highly recommend it as it is evergreen ,very hardy and has white flowers in spring followed by red berries in autumn

Photo and more information in the link below

http://www.flickr.com/photos/31559373@N00/3554081853/

Cotoneaster horizontalis is the one you want. You can trim off any branches that grow out further than you want them.