Btw, just to give you an interesting engine to think about, it's free:
CMS main page:
http://livestreet.ru/
Style which you are looking for:
http://demo.livestreetcms.com/flow/
However, it could be a lil hard for you. Because they have only a russian lang support as i know.
I'm a Russian speaker myself, if you want i can do help a lil
Im not telling that its the best, and they have some problems with SEO. Just sharing