try and set up a dynamic template if you can so you can do with the content what you want whenever, otherise page updates and site updates are going to be anoying, looking after a site should be fun
anyway, your question. If you want high click through rate embed it, use the horizontal one, but be clever, stick 4 images above it that line up with the text, will make it look more like content on your site an hence - better CTR.
Or embed one of the smaller templates into a paragraph of text.
Dont reat contextual ads, such as google adsense like a banner, ie, dont stick it as a skyscraper dow nthe right or a 468 on the top.
hope that helps anyway, g'luck