Wordpress is a solid foundation to build any site on. However, it is not the only option. You should examine your needs and then weigh your options. If you are new to webdesign and don't have much to invest, then Wordpress is a fantastic solution.
If you are trying to build something with functionality beyond just a blog, eg. ecommerce sites and forums, something might be a better suit for you. Wordpress can do these things, but something else might be easier to get into.
As far as SEO goes, almost any self-respecting CMS out there that expects to last should be SEO friendly.
Are you looking for recommendations for a specific solution, or is there something you don't like about Wordpress?
