Ditto on Wordpress. It's expandable, it will grow with your business and you can do a lot with wordpress. I too haven't heard of Yola so I went to look it up and notice that it's something similar to OfficeLive. Which got me thinking, that both Tess and I are speaking of the self-hosted version of Wordpress which can be found at
www.wordpress.org vs. the hosted version on .com.
If you plan on using wordpress you definitely would want to use the self hosted version - what does that mean? You'd need to get your own domain and hosting account, then install Wordpress and build your site from there.
Feel free to send me an email if you have a question about Wordpress.