There are free options to be considered out there. Wordpress can work, or you may take a look at a ready website that I built using Joomla CMS, have it on sale if you look at my signature. www.allseo.org
vivvo is an awesome CMS, but it's too expensive. The another disadvantage of it is that you have to pay extra fee for skin. Anyway, It's a very good SEF CMS
Yes, I knew it from adwords AD in DP. Although it's really good CMS, you should provide more plugins,for example forum,sitemap..etc